A Study In Anatomy
Part 1:
“Canis Lupus Erectus”
Miles, a human, finds himself overwhelmed with curiosity after moving to a city where the majority of the population are zetamorphs (human/animal hybrids). He becomes even more confused when he realizes he’s attracted to them. 
Though not explicitly stated until Part 2, all characters having sex in this story are over 18. 
AUTHOR’S NOTE: This version of “Canis Lupus Erectus” is a significant revision of the first entry in a series that I started eight years ago and was never able to continue. More background is available here. The original 2013 version is still available for those who prefer it. 

I. Lecture
Miles rolled a cheap condom onto his browning banana with a deliberate awkwardness he hoped matched his peers’. Since transferring to Seneca East High School two months earlier, the dark-haired human had quickly learned that his new classmates could smell and hear certain things that Miles had once assumed were private. In a sex ed class, that could be especially frustrating. Today, all he wanted was to make sure no one noticed how familiar he was with this particular activity.
Until the end of summer, a few months earlier, Miles had lived his entire life in the small city of New Garden, now on the other side of the country. New Garden was a small city, with a fairly wealthy population. As a result, it was well-isolated from the rest of the world, and Miles had never really considered what it would be like to live anywhere else. But, just a few months after the divorce, his dad had been offered a new, higher-paying job in Seneca City. 
They’d talked about it for a while, and, hoping for a fresh start in a new home, Miles ultimately encouraged his dad to take it. Now that things had settled, he was starting to wonder if that had been a mistake.
Compared to New Garden, Seneca City was massive. With a population of just under eight million, it was the second largest city in the country, and it was still growing rapidly. The city was also known as one of the few places in the world where humans were a minority – only about thirty percent of the total population. The rest were various zetamorphic breeds – humanoid-animal hybrids who had appeared over a century earlier. 
Being around lots of zetas hadn’t bothered Miles, at first. He’d actually been pretty excited. When he’d been very young, he’d been obsessed with them. His favorite cartoon had been Z-Squad, which featured a team of heroic zetas fighting mutated terrorists and the like. He still had most of the action figures in one of the cardboard boxes he’d yet to unpack back home. 
The problem was that those cartoons and even more modern media hadn’t actually prepared him for what it would be like to be around the real thing. Despite thick accents that emphasized long vowels and trills, he’d finally gotten to where he could understand them (most of the time), but even body language could be difficult to interpret – he kept forgetting that tails and ears were often more important than muzzles. Then there was the fact that many of them could hear his heartbeat, and recognize the way his smell changed when he was frightened or angry. 
Mr. Riley continued to refer to their bananas as “phalluses” while he paced around the classroom, and Miles soon held up his hand so the teacher could inspect his “work” and sign off on the class requirement. While he waited, he found his mind wandering to the last time he’d used a condom – his last night in New Garden. Those hours saying goodbye to Tyler, spent under the clear summer sky had been incredibly intimate, and had ended with the best sex they’d ever had. That was good, because he’d been celebate ever since. 
Miles was snapped out of that memory as Mr. Riley arrived at his desk and quickly examined his condom for breaks. The human’s ears burned as the German Shepherd praised his condom skills, which in turn elicited a few muffled snickers from his classmates. The teacher ignored them as he moved on.
Scowling, Miles threw his banana in his backpack – no sense wasting it – then slumped back at his desk to wait. The prospect of another 20 minutes of lecture sounded like torture, but at least while he was sitting there, he could stop worrying so much about getting a hardon.  
He passed the time by sketching in his notebook – he’d been working on a picture of Tyler for a few days and he liked how it was turning out. He only realized doing so out in the open was a mistake when he noticed the wolf-zeta at the neighboring desk staring at his drawing, tail slowly swinging behind him. Miles’ immediate reaction was to stare back, a gesture he hoped would communicate a silent “mind your own business.” That brought him face-to-muzzle with a pair of animalistic golden eyes that contrasted sharply with the surrounding coffee-colored fur, and Miles found himself blushing again. 
The drawing of his ex-boyfriend was a nude, of course, and while Miles hadn’t added much detail between Tyler’s toned legs, there was enough there for the wolf to get an eyeful. Tyler had been well-equipped, but Miles had taken a few liberties in his sketch. Flustered, the human quickly closed his notebook, then glared at the wolf again. His expression was difficult for Miles to read, but when the zeta turned his attention back to the front of the class, his tail dropped. 
This wasn’t the first time something like this had happened, but he was getting frustrated that even after two months, he kept slipping up. He was having a hard enough time adjusting to a new school and a new town, and he wasn’t as eager to burst out of the closet in an environment he didn’t fully understand yet. Being queer wasn’t a big deal for most people these days, but he didn’t want to push his luck while he was still trying to adjust to everything else. Keeping that part of himself concealed was an entirely new experience. 
Formally, he came out when he was 14, but even then, no one seemed surprised.
“That’s fine, honey,” His mom had said to him with a tense smile. “We’ll always love you, no matter who you decide to love.” Some of the religious types, like his mom, still had a ‘sex-is-dirty’ attitude, but she also went to great lengths to put on appearances as the perfect mother. The tone of her voice had still made it clear she was upset. 
Fortunately, his dad had been more sincere. “You know yourself better than anyone else, Miles. Do what’s right for you," he said. 
Later that week, he came to Miles’s room with a moderately-sized wooden box. “Hey, Miles,” he’d said sitting on the green second-hand couch Miles had bought the summer before. 
“Listen, your mom will think you’re too young to have something like this, but if you’re thinking about sex, I think it’s better for you to have it than not.” He put the box on his desk and slid it towards him. It had an intricate carving of a wolf’s head on the front.
As he opened the hinged lid, he found a bottle of lube, several condoms, and a booklet that explained some of the nitty gritty details of sex between men, albeit in very clinical terms. Still, it had been a thoughtful (and useful) gift.
After a longer talk, his dad’s expression became somber. “For what it’s worth, I hope you’ll wait a while before using this stuff. On that, I agree with your mom. But, I’ve seen a lot of things at the hospital, and I know better than most that sex is a normal part of life. The important thing is that you are safe and healthy. So, if and when you do need something like this, just ask. No questions asked.”
Mr. Riley’s baritone drew him back to the present.  “—which is why you should always use a condom, even if your partner is on hormonal birth control.” The teacher still had his hands clasped behind his back as he paced slowly back and forth in front of the classroom. That simple movement was enough to intrigue Miles. 
It was clear now that even the zeta actors he’d seen in movies were directed to be as non-threatening as possible. Even the athletes he’d watched in the zeta sports leagues, he’d realized, were often slouching or wearing uniforms designed to make them look smaller. In reality, every movement they made seemed to radiate a certain energy - like a swift current beneath the surface of a placid looking river. 
Mr. Riley, who was past middle age, a bit overweight, and showing considerable gray in his muzzle, was a perfect example. He wore an old-fashioned tweed jacket and gold-rimmed spectacles that made him look even older than he was. He should have been the embodiment of a non-threatening professional educator. But Miles couldn’t help but fixate on the bulk beneath that jacket, and the clear form of dense musculature visible beneath the zeta’s slacks. Even his hands, when they weren’t clasped behind his back, looked big enough to palm Miles’ entire head. That image brought several other unwelcome thoughts, and Miles quickly forced them out of mind. 
The problem was that this sense of a barely-contained-monster radiated from nearly every zetamorph Miles had met. It was worst with the large predators, but even the smaller herbivores – zetas like mice and rabbits – moved in an inhuman manner that both intrigued and intimidated him. Unfortunately, most of his classmates had noticed this, and a few had started using it to fuck with him. 
Was that what was going on with this wolf? Miles glanced back at the dark-furred canid. What had he been thinking when he saw that drawing? Would he tell his friends and spur another round of jokes and bullying at Miles’ expense? 
A sudden change of content on Mr. Riley’s slides drew his attention back to the lecture. A chart on the effectiveness of various types of birth control had been replaced by a side-by-side comparison of two human cocks: one cut, one uncut, shown both erect and soft.
“For the next few lectures, we’ll be talking about the nuances of male and female reproductive anatomy among various types of zetamorphs and humans. As you can see by the bare skin of the thighs and the lack of any sheath, we’ll begin with a discussion of the human penis. We’ll continue to cover the male anatomy through the most common zetamorphic species, then switch to the female anatomy.” Riley added, “Pay careful attention to these slides. They can save you some embarrassment in the future, and besides, there will be a quiz.” 
There were some grumbles from some of the class who had been hoping to be let out a few minutes early, but Riley was already continuing his lecture.
“The human phallus comes in a wide variety of shapes and sizes,” Mr. Riley was saying, “but the most drastic variation may be in the presence of the foreskin, which you can see in the images on the left side.”
Miles raised an eyebrow at the size of the uncircumcised model’s erection. Though his real life experience was still fairly limited, he’d seen enough dick to recognize something out of the ordinary. Compared to the relatively average circumcised cock next to it, the image Riley was using was bordering on the obscene. 
Unbidden, his mind immediately pulled up an image of Mr. Riley searching the internet for the perfect image of an uncut human cock while furiously masturbating. That helped him forget about his earlier embarrassment, but his jeans were starting to feel rather tight. With a subtle movement, he adjusted the fabric, then glanced briefly around the room. He was surprised to see how closely many of the zeta students were studying the slide. He also noticed a few others were “adjusting” themselves as well. 
“Both are perfectly normal,” Riley was continuing, “However, circumcised penises like the one on the right have had the foreskin removed, usually soon after birth, either for religious or medical reasons." The graying dog paused, which was his way of saying it would be on the test. 
Pens and pencils scratched on paper as a few of the students stopped staring and started writing in their notebooks. Miles didn’t bother, he knew more than most about the human penis. He was surprised to note that his neighbor, the wolf, wasn’t writing either. When Miles looked, the canid caught him and offered an enigmatic expression. He thought the way his mouth parted was supposed to be a smile, but all Miles could focus on were the sharp white teeth glistening with saliva.
He swallowed and struggled to keep from averting his gaze – fuck those golden eyes gave him goosebumps. Unconsciously, his eyes drifted lower, but that only made things more awkward. The wolf was hard. Maybe not full-on erect, but hard enough to pitch an unmistakable tent in his cargo shorts.
“This is a canine phallus.” In a brief moment of terror, he thought that Riley was explaining what he’d been staring at, but that thought quickly vanished as Miles turned his attention back to the screen.
The thick, veiny organs of three different types of canids were now displayed on the front projector, glistening wetly. Their red color made them stand out in stark contrast to the dark background behind them. Miles couldn’t look away. He’d seen a few canine sheaths in the locker room during his gym class, but he’d never seen what the organ inside looked like until now. Hell, he’d never even thought much about it. He’d been so busy walking on eggshells and missing Tyler that he’d barely allowed himself to think of his classmates in that way. Especially the zetas. Even without his awkwardness, there was such a stigma associated with zeta-human sex that the thought that he might like it had never even occurred to him. 
Miles heard Mr. Riley’s explanation of the slide, but most of it slipped from his mind as quickly as it entered. He kept trying to figure out if he was just intrigued by the exotic nature of what he was seeing, or whether there was something more. When he forced himself to focus, however, he found himself fascinated by the topic. 
“The bulbus glandis or ‘knot’ is the most distinctive feature of the canid sexual anatomy,” Riley said while using a laser pointer to identify exactly what he was talking about.
“The tissue structure is located at the base of the penis. When the male organ is sufficiently stimulated through masturbation or sexual contact,” there were a few more snickers at that, but Riley ignored them as readily as he had the others, “the knot expands until locked into place. Canid and vulpine females have special muscles within the vagina that can prevent a knotted male from withdrawing during ejaculation. While this enhances the pleasure for both partners, it also greatly increases the chance of pregnancy with a female in season, even with contraception. It also increases the risk of sexual injury in all partners. Those of you with this anatomy should carefully consider whether you want to tie with your partner before engaging in sex. Making the decision in the moment can lead to unwanted consequences.”
An awkward silence in the classroom was interrupted by the loud electronic chime ringing through the school. The students immediately began to pack up their notebooks, though perhaps with less urgency than usual. Several males were still showing signs of arousal and there was an odd smell that reminded him of the locker room after gym class.  
“All right, all right,” Mr. Riley said. “We’ll continue this on Monday. Don’t forget to finish reading chapter six in your textbook and to study the charts starting on page 260. Class dismissed.”
As the rest of his classmates filed out into the hallway, Miles took a moment to check his phone for messages, then started up some music for the walk to his next class on the other side of the building.
By the time he made his way into the busy corridor he was surprised to find the wolf waiting for him. Up close, Miles could see more variation in the wolf’s fur, or at least the parts that were visible. His face was primarily covered in brown fur so dark it was almost black, but there were hints of lighter browns in his cheeks and the thicker fur around his neck. Just visible above the collar of his shirt, the wolf’s chest ruff  had a maroon tint when the light hit it just right. 
He was leaning against the school’s beige brick, sporting what Miles imagined was intended to be a friendly smile. He offered a polite one of his own, and the zeta seemed to take that as an invitation. "Hey, New Kid. Where you heading?"
Miles shrugged, “Tech class,” he said. “East wing.”
“Sweet, mind if I walk with you?"
He wasn’t sure he liked where this was going. The zeta seemed like a nice enough guy, and Miles could really use some new friends. But, his intuition told him this was all about what the wolf had seen in Miles’ notebook. Straight guys didn’t make a habit of drawing nude men in provocative poses, and the wolf might just be looking for someone to suck his dick or something. 
Forgetting the whole zeta thing, he was the type: charismatic, “straight-acting,” athletic, and handsome. If he was like the similar humans Miles had known back home, the wolf would also assume that any guy who liked dick must surely be interested in his. Miles had occasionally indulged a few guys like that back in New Garden, but his relationship with Tyler had ended that. He’d matured since then. At least that’s what he liked to tell himself. That didn’t stop the photos from Mr. Riley’s slides popping back into his mind in vivid detail. 
“I guess,” he finally said in a neutral tone while putting his earphones down around his neck. No sense in being rude.
Miles set the pace as best as he could while dodging larger circles of friends blocking off sections of the wide hallways. The general din of chatter was punctuated by the percussive soundtrack of lockers opening and closing.
“I’m Alec, by the way, I don’t know if we’ve ever really talked.”
They hadn’t short of the occasional greeting. “Oh, no. I don’t think we have. I’m Miles.” 
“I know,” the wolf said, swinging tail smacking a few people trying to squeeze by.
Miles gestured towards a section of wall they were approaching. “My locker’s over here.”
Alec stuck close to him. “Right. Well, we only have that one class together. Oh, and Gym. Never really see you in there though.” That would be because Alec spent most of that period in the weight room.
For his part, Miles nodded while trying to remember his locker combination. The lock finally clicked open, and he smiled. The thing had a tendency to get stuck, and this was the first time he’d gotten it open on the first try.
“Truth be told,” Alec said, taking the smile as a good sign, “You’ve seemed pretty nervous around us beasty types, so I figured I’d keep my distance, you know. But it’s been a few weeks now. I thought maybe you’d be comfortable hanging out or something."
He paused and examined the wolf’s face, weighing just how terrible an idea this might be. Those eyes were still unnerving, but he thought he saw something that looked like sincerity, or at least genuine interest. 
“You really want to hang out?” He wondered what his dad would think about a wolf-zeta in the house. He’d always been open-minded about Tyler, and had never complained when Miles’ brought boys home before that. But he was also old enough to remember the riots in the nineties and the violence that had ensued in many larger cities. Plus, zetasex was considerably more taboo than simple homosexuality. In fact, it was still criminalized in most states. 
Miles was surprised to realize the illicit nature of the idea just made it more exciting. And, the simple truth was that he could really use a zeta friend that he could talk to about some of the issues he’d been having. 
“I mean, if you’re comfortable with it,” the wolf said. “I have practice most days, but not all the time.” 
With a half-smile that he hoped came across as coy, he let his hand brush Alec’s for the briefest of moments before answering. “To be honest, I’m a bit nervous. But I do have the house to myself most afternoons. Walk home with me next time you’re free.”
The wolf’s tail wagged.  

II. Homework
After Miles’ final class, he was only mildly surprised to find Alec waiting for him at his locker. The wolf’s tail swished when he noticed the human and his body straightened as he pushed off from the wall he’d been leaning against. “Hey. Practice got canceled tonight. Can I walk home with you?”
“Sure,” he said without having to think about it.
Miles did wonder if the practice thing was a lie. He knew the wolf was almost certainly looking for sex at this point. The thing was, after having most of the day to think about it, the human was almost certain he wanted it too. It had been two months. And he couldn’t get the images from Mr. Riley’s class out of his mind. Zetasex might have been a misdemeanor in Seneca City, but sodomy had once been illegal, and that had never stopped anybody. Besides, it wasn’t like a SWAT team was going to break down his door the second he put Alec’s dick in his mouth. 
He smirked a bit at the mental image, though he worried about how easily he was imagining blowing the wolf. He didn’t want Alec to think he was a slut, but the truth was, he kind of liked thinking of himself that way. Tyler had used to whisper dirty words like that into his ear while they fucked, and Miles still fantasized about it sometimes. 
As Miles and Alec walked south, the human found himself struggling to focus on their conversation. His mind kept fixating on the fantasy of what it would be like to sleep with the wolf. And, he was certain the wolf could smell the arousal on him, because Alec was rambling. 
Fortunately, during the fifteen minutes it took them to reach Miles’ house, the conversation stayed mostly innocent. Alec talked about the basketball team and the Seneca sports teams he liked. Then it became a discussion on video games and this old car Alec’s dad had fixed up. Miles didn’t really care about any of those things, but he found the wolf sweet and easy to talk to. They finally found some common ground when they started talking about a few recent superhero movies they both liked, including a new adaptation of Z-Squad. 
As expected, when they reached the house, Miles saw no sign of his dad. He worked long shifts most days, and rarely was home before dinner time. That meant he’d have the house to himself for another three hours. Miles pulled out his keycard. “Well, this is it,” he said. “You live nearby?”
When he looked back at the wolf, Alec was rubbing the back of his neck. “Ah, well, no,” he said, “Our place is up north.”
“You mean you just walked a mile in the wrong direction?” 
Alec flicked his ears and gave a wry smile before shrugging.  
“Why didn’t you say something? We could have just talked at school or something.”
The wolf was looking down and his tail curled around one leg. “Oh. I thought it might be easier to talk if we were at your place.”
Easier to get in my pants, Miles thought to himself. He felt a familiar warmth in his groin. This situation should have unnerved him. And there was something about the wolf that felt off. He should make up some excuse and send him away, he told himself. Instead, he found himself staring at the canid’s broad chest. The tight shirt he was wearing looked really good on him. 
Alec was more animated as well. His ears were perked, and his tail was wagging faster than Miles had seen it before. Miles thought it was cute. 
The wolf opened his mouth a few times to speak, perhaps trying to think of something clever to say. He finally settled on a simple, “So, can I come in?” 
Miles opened his mouth to say no. What came out was, “Sure.”
The house was too big for two people. The move had been so fast, they hadn’t had time to be really selective in the house they picked. Even after eight weeks, most of the furniture was still unused, and full cardboard boxes were still a ubiquitous decoration. Nevertheless, the zeta stepped with museum-like reverence as Miles dutifully showed him the kitchen with all the smart appliances, the formal dining room that had already accumulated a layer of dust, the large family room with the half-assembled home theater, and then the upstairs bedrooms. 
By now, Miles felt the familiar thrill he always felt when sex seemed imminent. He was half-hard again, but in his own element – or at least closer to it than he’d felt in a very long time. 
“Wow, you have a huge room!” the wolf said as he ran a hand over the hastily made bed. “King size?”
“Ha. Bear-size, actually.” 
The bedroom was a bit ridiculous. The previous owners had been large ursids, which meant the ceilings were high and the floor plan included a lot of extra space. Miles’ room was typical of the rest of the house, in that it was nearly twice the size of his previous bedroom. The furniture, which had come with the house, was also about twice the size of anything Miles needed. There was a wooden executive desk with an expensive-looking chair upholstered in durable faux leather along with a four poster bed. A pair of large bookshelves along the inside wall, a long dresser, and a deep, navy blue sofa, still weren’t enough to make the space feel lived in. He felt a bit self-conscious that he hadn’t put up any decorations yet, but Alec didn’t seem to notice. He was still running a large hand – paw? – over the plush comforter. 
“The furniture came with the house,” he explained. “My mom took a lot of our stuff when they divorced, and dad didn’t want to haul what was left from New Garden, so they worked that into the deal when we bought this place.”
Miles could see Alec’s nose twitching as he took in the rest of the room. He suspected the wolf would be able to smell everything Miles had done in the room over the last few weeks, but he didn’t say anything. 
The wolf’s attention fell to the desk, where Miles kept a slim gaming laptop and a dock that connected to an oversized monitor. Miles didn’t like using the big television in the cave-like family room downstairs, at least by himself, so he’d set the laptop up to be his media center on top of everything else. He could turn the screen and watch from his bed or the sofa comfortably. 
“Nice,” Alec said as he looked at the laptop, although his eyes soon drifted to the large wooden box he usually left on his desk, if only because he still kept his lube. The wolf’s head carved onto the lid looked a little like Alec, and perhaps that’s why he peeked inside without asking. 
“Whoa. Holy shit!” 
Miles felt his cheeks flush again as he stepped forward. He’d added a few other things to the collection over the years, including a small vape and some pod cartriges, some poppers, a couple modest sex toys he’d bought online, and most of his porn, stored on a couple of data cards. He really didn’t want Alec to start asking questions about those. Fortunately his attention seemed drawn by the other items in the box. 
“This is the nicest stash I’ve ever seen. Aren’t you worried about your dad going through your shit?” 
Miles shrugged, trying not to appear too defensive as he slid the box away from the wolf’s grasp. “Dad’s a doctor, so he’s kind of detached about a lot of this stuff.” Miles made a bit of a show of slowly withdrawing a couple of condoms and the clear bottle of lubricant one at a time. “He bought most of this stuff. As long as I’m safe, I’m free to do what I want. He asks me about it sometimes, and I’m mostly honest. It works out.” 
Alec nodded, eyes fixated on the condoms, tail wagging again. Miles closed the box and quietly put the box into a drawer. The wolf took the opportunity to move towards the other side of the room where he settled into the sofa. Miles soon joined him. 
“Thanks for letting me up here. I don’t think I’ve ever been in a human’s bedroom.” He was leaning back and slipping an arm over the back of the sofa. The move was transparent, but Miles liked it. He could feel the warmth of the zeta’s thickly muscled arm radiating against the back of his neck.
“Did you, uh, want to do something?” he’d never been good at this part.
Alec flashed a few teeth – Miles could recognize the expression for a smile now. “I can think of a few things that might be fun,” he said as those big gold eyes wandered over the human’s body. 
“Oh, yeah?” he said, swallowing back his remaining reservations. 
The wolf had leaned in closer, his muzzle within inches of Miles face, taking in his scent. The gesture was distinctly canine, but he instinctively returned it, inhaling slowly through his nose. The scent had an earthy quality to it. Clean, but distinctly masculine. It reminded him of the way grass smelled on a hot summer day. Alec’s arm had settled onto his shoulders. The touch felt good, so Miles placed a tentative hand on the wolf's strong chest, his breath catching at the feel of the muscle beneath the fabric and fur.
Miles was hesitating again. He was simultaneously frightened and aroused, and he wasn’t sure which instinct he should act on. Picking up on this, Alec let out a soft chuckle. “I know you’re conflicted about this. I’m nervous too. I’ve never been with a human, but I’ve wanted to try for a long time.”
The human jerked his hand back as if he’d been burned. Was this just some fetish thing? Fuck, he didn’t want to be someone else’s experiment. Except, wasn’t that what he was doing to Alec? 
“Relax,” the wolf said in a sultry rumble that raised goosebumps on the back of Miles’ neck. The wolf had his muzzle right next to his ear now, and he felt the warmth of his tongue along the edge of it. “You’re making this bigger than it needs to be.” 
The human shivered.
“I could take you right here,” he continued. “Do you want that?” Alec’s warm body was pressing up against his. His heavy arm was holding him in place while that long, wet tongue journeyed down the human’s neck.
He gasped when he felt the prick of sharp teeth where his neck met his shoulder. His painfully erect cock throbbed in time to the pounding of his heart. He’d never felt so vulnerable before, let alone during sex. With Tyler, it had always been the ultimate form of relaxation. It has always been safe and controlled. Now, he was frightened. But, disturbingly, he was also more aroused than he could ever remember being. The wolf’s natural scent was growing stronger, and it seemed to stir something primal deep inside the human. His rational mind was surrendering to a deeper instinct beyond fight or flight. What he wanted to do more than anything was surrender himself to this other male.
Letting go of the last of his inhibitions, Miles put his arms around Alec’s neck and soon found the wolf’s tongue greedily exploring the inside of his mouth while he shivered in pent up ecstasy. With surprising dexterity, the wolf carefully drew his tongue along the roof of Miles’s mouth which elicited another muffled cry from the human. He tilted his head back to break away, only to expose his throat to the wolf. He gasped at the heat and wetness as the zeta took what was offered to him.
Miles didn’t even consider resisting as he was pulled close. Fingers tugged at his shirt, and the human let it be removed before reaching for the bulge in Alec’s shorts. The wolf was producing so much precum it had soaked through the fabric straining against the clearly outlined tip of his cock. A sharp, burning pain brought Miles back to lucid reality. He gasped in shock more than horror, suddenly realizing how much he’d lost himself in the moment. It reminded him of the way he felt the time he’d tried ecstacy. Except the pain had brought him back to sudden lucidity.
If Alec had noticed, he didn’t seem to care. He was trying to push Miles onto his back, but he resisted. The wolf pushed harder until, with a hard shove and a loud “Stop!” he managed to get the wolf to back off for a second. He breathed, trying to think clearly. 
This was dangerous. He’d been letting his dick make decisions for him, and now the warm trickle of blood down his back was a visceral reminder of the risk he was taking. Zetasex was so controversial, in part because of how easily humans could get hurt. Despite that, he could feel the wolf’s hardness pressing against him, and a part of him still wanted it. He realized that if he didn’t stop it now, he wouldn’t be able to.
Miles raised a hand. “That’s enough,” he said, forcing himself to stand while reaching to feel the scratches on his back. They weren’t deep, but there were three of them. His fingers came away red.
“You’re hurt?” The wolf said, apparently smelling the blood before seeing. He’d been as caught up in their arousal as much as Miles had been, “Was it my claws? Fuck, I’m sorry, Miles. Are you OK?”
The human found his voice after what felt like an eternity. His heart was still pounding, but common sense had reasserted itself. “It isn’t bad, but I should take care of it.”
Alec’s eyes narrowed at that, but he kept his mouth shut, perhaps hoping Miles would explain. When he didn’t, the wolf asked flatly, “You want me to leave?”
Miles averted his eyes. “Yeah.”
The wolf didn’t seem angry, though he remained stiff and overly polite while Miles walked him to the door.
To his credit, he didn’t offer profuse apologies, or insist that he would be more careful in the future. He just collected the backpack he’d left by the door and said, “Thanks for letting me come by,” he said. “We’ll have a double practice tomorrow, but let me know if you want to hang out again sometime.” He opened the door, then paused. He looked back, “I don’t want to be pushy, but it’s supposed to be difficult – the first few times. So, if you want to try again, I can wait until you’re ready.”
He hadn’t known what to say to that, so he gave a generic nod, then closed the door in Alec’s face. Moments later the human was in bed, naked, his hand pumping desperately at his dick. It took him less than thirty seconds to get the release he needed, crying out as the product of what would be the first of several climaxes that night splashed onto his chest and stomach. In that moment, he regretted sending Alec away, but as he cleaned up the mess only then noticing the red stain on his sheets where he’d been laying on his back, he felt nauseous. They hadn’t even gotten beyond foreplay. How much more would they lose themselves if they actually went all the way?
He spent the rest of the evening trying to sort out his thoughts, but that only kept him horned up. By the time he’d jerked off thinking about it for the third time that afternoon, he was starting to realize that whatever was stirring inside him was more than simple curiosity.

III. Study
Miles swallowed as he pretended to check his phone. Like most of the other humans, he’d gotten into the habit of changing on the far side of the locker room, which was designed for humans and smaller zetas. Since many of Seneca’s zetas trended on the large size, it was fairly common for public facilities to design spaces for those breeds, but the Human Accessibility Act required that public buildings dedicate at least 50% of their space to accommodating human-sized individuals. In Seneca, this meant that the human spaces were almost always more spacious.
However, there was no rule that required humans to use that side of the locker room or vice versa. Zetas, even smaller ones, rarely crossed into the human side, though humans occasionally made use of the zeta side to take advantage of the larger lockers and quicker access to the weight room and pool. Miles had never considered becoming one of those humans until his encounter with Alec the night before. More specifically, after he’d jerked off to another fantasy of Alec for the sixth time that night. 
The next morning, he sat on the carpeted bench in front of the locker he’d stashed his gym clothes in. The human was wearing a pair of cargo shorts and a plain t-shirt, attempting to feign interest in an old text message from Tyler while examining an equine classmate’s sheath and balls with his peripheral vision. The reason he’d decided to try this was so he could try to understand his sudden interest in zetasexuality. He wanted to see if it was just something about Alec that Miles found attractive, or if it was a more generalized attraction. 
The sensation of his dick starting to swell, still sore from the previous day’s activities, gave him an answer he wasn’t ready to accept. He was also rapidly realizing that this had been a bad idea. Once again, the human found himself one sniff or sidelong glance away from making an awkward situation into a disastrous one. He tried looking towards the other side of the locker room to clear his mind, but he instead found Mark Isaac’s leonine sheath right at eye level. He had no idea why so few of his zeta classmates bothered with underwear, but it certainly made this side of the locker room more interesting.
As his skin flushed, he realized the longer he stayed here, the more likely his state was to be noticed. Deciding this was too dangerous, he shoved his hands into his pockets to partially conceal his erection while he skulked to the bathroom and promptly locked himself in a stall. It was still early in the day, and the stall was actually clean, or at least as clean as it got in a high school locker room.
Still feeling anxious he sat down on the toilet and waited for the students to clear out. He could handle being a few minutes late to class today. Coach Card seemed to like him, and he’d yet to be late to this class. Thankfully, no one else came into the bathroom area on this side of the locker room for more than a quick piss, which allowed him to get his thoughts under control. He’d never been one of those shy kids, so embarrassed by nudity that they needed to change in a stall, but today, he understood what that might be like. 
It took five minutes before he was confident enough to head back out to his locker. There was no one else around, so before changing into his gym uniform, he decided to take a few minutes to creatively apply some of his deodorant between his legs. The lightly scented gel left an uncomfortable cooling sensation, but he decided that was better than smelling like precum - he’d leaked enough into his underwear that zetas with good noses would probably assume the worst. 
It was while he was carefully spreading the gel onto his dick with his underwear down around his ankles that Alec made his way out from the other side of the locker room on his way to the gym. He was singing the chorus to some old rock song when he spotted Miles.
“Oh, there you are.” He said, sounding genuinely pleased. “Was looking for you on the other side.” He stopped, midstride, when he noticed where Miles’ hand was. “Oh.”
The human swore as his entire face began to flush. He quickly bent over to pull his underwear up, not even thinking about the view he was giving the wolf until after. That made the blush worse. “It’s not what it looks like,” he hastily spouted, wincing at the cliché. God.
“Hey, it’s cool. I’ve done that here plenty of times. Usually better to wait till after class though. There aren’t any gym classes next hour.”
“You’ve got the wrong idea, Alec,” he said while scrambling to cover himself. Of course, the mental image of Alec jerking off in here restored his erection in record time. “Fuck.” 
As he turned around, it was obvious Alec had already noticed – not that the shorts he’d hastily slid on left much to the imagination. Groaning, Miles grabbed his shirt and held it over his crotch. The wolf’s eyes were lingering on him, and the human suddenly felt self-conscious about every aspect of his exposed body - from the pierced right nipple to the appendectomy scar that was still visible on his pale, sensitive skin. 
“Whatever you say,” the wolf said with a shrug before walking away, picking up his song right where he’d left off. 
Miles waited about thirty seconds, silently wondering what the hell was wrong with him before slipping his shirt over his head and joining the rest of his class. As usual, once warm ups were done, Alec went straight to the weight room with a few of his other zeta friends. Miles made eye contact with him once. He’d intended to say or do something friendly to apologize about the awkward encounter. Both of them, really. But all he managed was another blush and quickly averted eyes. He pretended to be staring at one of the air ducts instead.
“Miles,” Coach Card said. The feline zeta’s voice had a natural rasp to it that pulled Miles out of his emotional daze. “Which track are you on today?”
Coach Card was a zeta-tiger, probably in his mid-thirties. He was pretty laid back with a typical gym-teacher build – lots of upper body muscle definition, a bit of a beer gut, and legs that looked a bit disproportionate. 
He shrugged. He didn’t remember what he was assigned to. “Uhh… Thought I’d go with the cardio group today,” he said. He usually alternated between that and aquatics. Today, he hoped some hard running would exhaust him enough to keep his sex drive in check the rest of the day. He really needed to figure out a way to deal with this little problem, but at least he wouldn’t have to worry about Mr. Riley’s class until next week. He wasn’t sure he could handle that today.
“OK, that’s fine, but take it easy. You’re looking a little red. Sure you’re feeling okay?”
He nodded, “Oh. Yes, Coach. Sorry, just having a rough morning.”
The tiger seemed to accept that, and a few minutes later, Miles was out running sprints with a dozen or so other kids underneath the unseasonably hot October sun.
Miles had long since given up trying to keep up with most of the zetas, especially on sprints. Anthony Meehan was always assigned to the cardio track, and on sprint days, the cheetah was at the finish line by the time Miles was at the halfway point. By human standards, Miles had been a good sprinter, but here, he was in the middle of the pack. The competitive part of him still kept track though, and he noticed with some pride that he seemed to be improving. Of course, that might have just been a product of whatever hormones had been pumping through his system for the last 24 hours. He seriously hadn’t felt like this since the first time he’d been topped and had been obsessed with it for like a week – poor Tyler had been sore for days.
The rest of class went by smoothly, and after thoroughly exhausting himself trying to keep up with the others, Miles thought he’d succeeded in working himself to exhaustion. He’d be sore tomorrow, but his mind felt clearer than it had all morning. Of course, that didn’t stop him from taking an extra slow walk back from the track field, or from spending a solid three or four minutes fussing with his hair in front of a mirror before heading to his actual locker. The showers were still going and the typical loud teenager conversations were still echoing around the room, but most of it had died down. Miles was starving, and his dick hadn’t acted up for over an hour. He was fairly confident he could handle a quick shower without going back into slut mode. However, things didn’t quite work out that way.

IV. Practicals
There were four guys in the shower, each under their own narrow stream of hot water. Two metal pillars in the middle of the tiled room were mounted with shower heads that were all filling the room with a steamy mist. He’d washed in rooms just like this dozens of times, including the one on the human side of the locker room. As he felt the eyes of the zetas on his scratched-up back, he realized he should have just gone back over back there. Unfortunately, he was committed now.
Each step towards his classmates was deliberate and measured. By now, no one was paying him much attention, but the conversation slowed as most of them took sidelong looks. He must be as strange to them as they were to him, but he angled one of the shower nozzles as far down as it would go and pressed the metal button to summon his own spray of hot water.
Conversation picked back up after that and though Miles didn’t exactly feel welcome, he didn’t think the others minded him there. Miles went about washing the sweat from his body, and the other guys gradually finished up and left. Just as the human was finishing up, he heard a familiar voice.
“Hey, Jack,” Alec said, greeting the rabbit who was on his way out. He had been the last of the showering zeta’s and Miles was now alone. 
Alec had to have noticed Miles, but if he did, he didn’t react. The wolf just walked under one of the nozzles that was still on and began lathering up his fur using shampoo from the public dispenser. “S’up, Miles,” he said as he worked splayed fingers and claws through his coarse pelt. Miles tried not to stare at the wolf’s thickly muscled chest, but his eyes were drawn to a triangular patch of white fur right between his pecs. “Get a good workout in?”
Miles was busy thinking very hard about how he shouldn’t let his eyes go any lower, but he managed a nod. He’d stopped trying to rinse off, and most of his body was still slick from soap. 
“Awesome. I should run more, but all the guys ever want to do is lift,” he shrugged, “Not that I mind. Strength has its advantages.”
The human swallowed. His mind had immediately summoned one of the fantasies from the night before, in which Alec had been pinning him against his shower wall, slowly explaining all the parts of his anatomy while they slid into him.
Alec smiled and dipped his head under the shower head. That was when Miles realized his old friend, the conspicuous erection, had returned. He immediately tried to cover it up with one hand, but Alec had clearly seen. He was still smiling when he shook some of the water off of his head and straightened.
“Guess that’s still bugging you, huh?” Alec said in a tone reminiscent of their misadventure the day before. Flirty but amused. “That’s OK, mine too.” He gestured down and Miles instinctively accepted the offer before he fully understood it. His lips parted in a barely audible moan as he caught sight of a very heavy-looking sheathe and an emerging hint of redness between Alec’s legs. The wolf widened his stance, as if to make sure Miles had a good view.
He couldn’t look away. Blue eyes were inexplicably drawn to that shock of red. Alec wasn’t fully hard; at least not like the canine in the photo from the day before had been, but at least four inches of veiny red dick were now protruding from his sheath and as Miles looked, more continued to slip free.
It was thicker than the one he’d seen in Mr. Riley’s class. Longer too. His mouth was watering.
If he noticed, Alec didn’t say anything. He pumped some extra shampoo from the dispenser, worked it up into another lather into his hands, then casually brought it down over his cock. “Watch if you want,” he said.
With practiced movements, the wolf worked his fist over the eight-or-so inches of cock. Miles could have sworn it was visibly throbbing. He could see precum drooling out in quantities that would have made any human he’d been with seem dry by comparison. The wolf’s natural lubrication mixed with the soap to make a slick mess, but Alec didn’t seem to mind. He adjusted his grip and started working himself a little faster. A second hand went up to brace himself on the pillar of the shower, and his breathing began to quicken.
Miles felt his knees weakening as he watched this. Later, he would say he had no control of his actions and that some instinct or unseen force drove him to do what he did next. But that would be a lie. At that moment, Miles knew he had a choice: whether to be an active participant or a passive observer, and though he was calling himself a slut, Miles’s knees splashed into the water only seconds before he was wrapping his arms around Alec’s muscle-bound thighs and sliding his mouth over his classmate’s wolfhood: soap, pre, and all.
The taste of the soap was bitter and acrid, even when cut by Alec’s natural flavor, but Miles didn’t care. The heat against his tongue, the sensation of wetness on the back of his throat, and the guttural moan rumbling from the zeta was worth any discomfort. A feeling of intense pleasure washed over him when Alec grabbed the back of his head and pushed his hips forward. Had Miles been less experienced, this might have scared him, but he’d learned to control his gag reflex with Tyler, and now he was putting that hard-earned skill to good use. He swallowed Alec’s cock up to the root on the first try, and though his throat tried to rebel, Miles mentally beat it into submission. It felt so satisfying to have a dick down there – far more satisfying that he remembered it. 
It was only as Miles nearly collapsed that he realized he was about to cum. The sensation gripped his body, starting at his balls, then pulsing through most of his body as he released six or seven ropes of fluids over the tiled floor. He hadn’t even had to touch himself. 
Had Alec not been holding his head, Miles would have surely been forced to release Alec’s dick. Fortunately, Alec seemed to have some experience of his own in these matters. Or maybe he just liked the sensation of a human throat wrapped around his cock. In either case, Miles considered it a good thing at that moment. Even as his climax faded, his own cock continued to throb with need. He’d never been insatiable, even with Tyler during those first heated weeks. 
Sadly, he wouldn’t have a chance to bury his nose back into Alec’s soaked pubic fur for a while. The wolf’s knot was starting to form, and as ambitious as Miles was feeling at this particular moment, he was certain he wasn’t going to be able to get his lips around that. Of course, that didn’t stop him from beating them against the hardened flesh while continuing to pleasure the zeta with as much skill and energy as he could muster.
“Miles, slow down a little. You don’t need to go that fast,” Alec murmured to him after a moment.
Miles knew that this kind of feedback was important for good sex, but he still took it as a bit of an insult to his abilities. It also made him self-conscious enough that he started to lose focus and soon he was forced to pull back as a muscle in his jaw cramped. He kneed there in the water, panting, the shadow of this animalistic male looming over him as he rubbed at his stretched lips, now puffy and swollen from self-abuse. He let the tip of Alec’s beautiful cock rest on his bottom lip as he looked up at Alec with lust-filled eyes. 
The wolf was looking down at him with another one of those expressions he didn’t know how to interpret. He thought it might have been something like appreciation, but it could have just as easily been simple horniness. In either case, it made Miles shiver and kiss the other male’s cock as if it were some great treasure that he’d been searching for, smearing spit, soap, water, and precum over his lips. His jaw was still sore. As was his throat. The mixture of fluids, worked into a slight froth, was dripping down his chin. At some point the shower had stopped and he hadn’t noticed.
He wasn’t sure he could continue, but as he prepared to try anyway, the wolf stopped him.
“Stand up,” he said with a slight snarl. There was no question there, and though Miles had trouble with zeta body language, the expected obedience was impossible to misinterpret. Miles did as he was told. They kissed again, the zeta’s tongue dancing over his lips in slow passionate movements that made Miles simply open up to the stronger male. And as that hot, wonderful tongue explored his mouth, Miles let out a soft moan, all the while keeping his hand wrapped around the zeta’s pulsing erection. Feeling bold, he let his hand close softly around Alec’s knot. Would that be enough to finish him off? 
“Miles,” he gasped after a few more heartbeats that seemed to last for hours, “If you’re going to stop me again, now’s your last chance.”
That set off a red flag somewhere in his mind, but he was long past caring. He needed this. As did Alec, apparently. He nodded. 
The next thing Miles knew, he was being shoved onto his stomach while the dripping wet wolf climbed over him. The soapy wet floor and his own wet skin made it difficult for Miles to keep his knees from slipping, but Alec braced his own legs next to his and held his hips in hands that encircled around his entire waist. His claws, noticeably blunter than they had been the night before, dug into his flesh for added grip.
“You’re fuckin’ slippery,” he muttered as he slid a thick finger down his cleft. The touch was enough to make Miles think he was close to cumming again, but he still hadn’t touched himself. Alec pushed gently but insistently against his opening, which gave way, but only reluctantly. “And tight. . . are you really ready for this?”
Miles rested his head on his forearms which he’d gathered underneath him as a makeshift pillow. He wasn’t sure he’d be able to keep himself upright without the support. He was weak, his head was spinning, and his body ached with a feverish need. He was a bullet about to be fired by a very thick hammer. He nodded.
Alec didn’t ask again. The zeta withdrew his finger and soon replaced it with the slippery pointed glans of his cock, though he didn’t force himself inside. At least not yet. Instead, he slid the broad column of masculinity against the smooth skin of Miles’ ass while smearing more and more precum against his cleft. Somewhere, Miles registered that he was slicking himself up, but he was filled with a desperate kind of impatience. It made him feel far more animal than the wolf that was preparing to fuck him. 
Sensing his impatience, or perhaps just acting on his own needs, Alec shifted his hips and grabbed the base of his cock. In a relentless, determined push, the wolf shoved the tapered length as deep as it would go. Miles grunted and clawed reflexively at the ground to get away from the sharp, burning pain, but his body was simultaneously wracked with another unexpected orgasm. Alec should have waited. He should have pulled out and given Miles a chance to catch his breath. He didn’t. Miles wasn’t even sure Alec had noticed his discomfort. 
There was no gentle rocking, stretching, or humping. Within seconds, Alec was delivering full-on long-dicked thrusts to the smaller male. If anyone saw them, there would be no mistaking the hard rutting for anything else. This was near-mindless fucking punctuated by the sound of heavy hips wetly smacking loudly against Miles’s bare flesh and Miles’ occasional gasp for breath as he tried to endure. Neither seemed to notice or care that they were making so much noise.
When Miles’ eyes uncrossed, he vaguely realized he’d been drooling onto his arm. He lifted it to wipe his chin, but the force of Alec’s body slamming into his caused his head to nearly slam into the tile floor. Hygiene would need to wait.
Despite two consecutive climaxes, Miles thought he was handling things fairly well. Tyler had always been a considerate lover (overly so, Miles had thought more than once). By contrast, Alec was... well, a beast. The human’s body was a conduit of intense sensation. He couldn’t hold back his cries. Yes there was pain, but above all was an overwhelming pleasure and a sense of need.
As in his fantasy the night before, Miles soon realized that Alec would want to tie soon. Perhaps he did already. He could feel what Mr. Riley had called the bulbus glandis rocking hard against his body with each downward thrust. And like in the fantasy, Miles was certain that no amount of force would make it fit. Of course, on the internet the night before, he’d read all about how it was best to use a hand to hold a zeta-canid’s knot when he was about to cum. Dutifully, and admittedly eager, Miles reached back.
The ferocity of the sudden growl and tightening grip on his hips shocked Miles and brought a sudden moment of rationality, his reasonable mind surfacing amid the sea of hormones and sensation. Something wasn’t right. He reached again, and this time, Alec grabbed his wrist and pinned it painfully to the small of his back.
His thrusts were slowing, but somehow getting harder. He could feel the wolf grinding against him and rocking his hips while his body futilely tried to accommodate the massive knot. Miles felt more full than he ever had in his life. “Alec, stop!” It was too big. God, it was going to tear him in half.
Alec just shoved harder and Miles groaned both in pain and fear. He had felt vulnerable before, now he was entirely at the other male’s mercy. There was little Miles could do to stop the stronger male from doing whatever he wanted, at least not here. He scrambled uselessly at the floor, but the soap kept him from gaining any traction. “Fuck, no! Stop!”  
When the wolf slowly withdrew his length, Miles allowed himself a relieved sigh. The wolf had finally heard him, he thought. The violent shove that lanced the full length back into him, knot and all, obliterated that, along with most of his other thoughts. His entire existence in that moment was an intense burning pain and the terrifying sensation of his insides being stretched to their absolute limit. He screamed, but Alec stifled it with a hand, the leathery pads practically smothering him.
The painful tugging at his insides that now accompanied the movement of Alec’s hips served as confirmation to Miles as to what had just happened. All anger faded the moment he also began to feel the immense warmth accompanying the throbbing and twitching of the wolf’s dick. Miles sobbed between paralyzing shudders of pleasure. He was cumming again. Three times in minutes, and he hadn’t even touched himself.
The time immediately after the tie would be a haze in Miles’s memory of the event. What stood out was the feel of Alec’s heavier body resting against his while his cock continued to pump cum into him for what felt like an eternity. The wolf was licking at Miles’ shoulder, neck, cheek, and anything else he could while whispering words of praise to him.
The human’s next moment of clarity came when Alec’s dick finally released its seal with Miles’ insides. He suddenly felt very empty as a flood of hot liquid poured out of him along with Alec’s softening dick. The wolf slowly got back to his feet, and though Miles realized he should do the same, his limbs refused to move.
Alec broke the relative quiet, “Miles, we should get cleaned up.”
Miles grunted and managed to get back to his hands and knees. The floor was still slippery, especially when his knees slid through the mess that had been inside him a moment earlier. Alec, ever so helpfully, turned the showers back on. “Fuck,” Alec said in a chipper tone. “That was intense.”
Miles felt tears stinging his eyes as he finally managed to get back to his feet. He gingerly felt his tender ass. Even clenching, his hole still felt too big. The word “destroyed” came to mind.
“Dude, are you crying?” Alec said. The jock swagger had vanished from his deep voice. He sounded legitimately concerned and he stepped towards him, looking confused, and a little hurt. “I thought I did a good job. I know you came,” he said, placing a tentative hand on his shoulder, “Was it that bad?”
Miles didn’t know what to say to that. The anger he’d felt before boiled back up and he brought it all to bare in a punch he delivered right to the side of Alec’s muzzle that sent him stumbling back. “What the fuck!?” he yelled.
Alec rubbed his cheek and looked at Miles, his own anger cut only by the deepening sense of hurt. 
“What part of ‘Stop’ didn’t you understand!?”
Alec looked even more confused by that. “I...I thought you were just trying to get away. It was…”
“I was! It fucking hurt!”
Miles had never felt more violated, though he wasn’t sure how much of that emotion was about how easily he’d lost his mind during the encounter, or the way Alec had knotted him even though he’d told him to stop. The wolf made an expression that Miles had no idea how to interpret. A grimace, perhaps? Or maybe anger.
“Miles, I warned you. I asked you. Twice.” The wolf looked to him as if expecting that would explain everything. When Miles didn’t react, he sighed. “I’m sorry,” he finally said. His shoulders visibly sunk and he lowered his eyes. “This was a mistake.”
After the wolf left, Miles, still shaken and stunned, struggled to pull himself together underneath the steamy water. Sometime later, after he’d managed to clean himself up and get dressed, he found himself laying down on one of the wider benches on the human side of the locker room. He was too sore to sit comfortably. Alec was right about one thing, this had all been a horrible mistake. But he couldn’t deny that in spite of the violation, deep down, he’d enjoyed it. For the first time since Mr. Riley’s class the day before, he felt relatively relaxed. Unless he thought about Alec.
When the bell for lunch rang. Miles forced himself to stand. He was already thinking about how he’d manage to sit comfortably in his next class when he heard a familiar voice. “Miles,” said Coach Card from behind him, “we need to talk.”
----
End of Part 1