Todd and Jacob were brothers, but few would surmise this simply by looking at them.
	Jacob was a hulking specimen of a lion. He stood comfortably at six and a half feet tall. His golden mane was traced with licks of red from their mixed heritage and was almost supernaturally full and lustrous. Even after a shower or when sweaty from a morning run, it never seemed to collapse or lose its power to grab the attention of everyone present. His muscles were eye-catching, but he had a symmetry to his proportions that had won him many a pageant.
	Todd, meanwhile, was not much to behold. The thirteen-year-old was on the shorter end of most boys his age at four feet and a few inches. His mane had started to grow in over the last two years, but had been kept trimmed. The red fur that the boys had inherited instead presented itself as an embarrassing heart-shaped patch on his back that he always tried to keep hidden. He lifted weights and ran with his brother which had led to him having more of a runner's build rather than one for showing off. The teenager had always been slower to grow than other boys, evidenced by his need for diapers on long road trips and at nights.  
	More often than not, Jacob would be confused as Todd's father, and it wasn't completely unfounded. After the pair's parents had left the picture, Jacob had been given the opportunity to become the legal guardian of his brother who was 15 years his junior. At the time, Jacob was with his high school sweetheart Jessica, and while she wasn't a fan of adopting him, she left the decision to him. He wouldn't abandon his kid brother and so they took custody. 
	Over the last eight years, Jessica and Jacob's relationship had changed. Jacob was completely supported by Jessica aside from some pocket change he made from his videos or winning competitions. When they were in high school and shortly thereafter, their closeness had been more of something like a friendship that led to cohabitation. He considered her his girlfriend, but once it came time to seal the deal on their intimate pairing, he grew uncomfortable with the idea of having sex or even kissing. Something had felt wrong. 
	It was a few years ago in the backrooms of a strongman competition that he suddenly and violently came to an awakening. He was alone in the showers, washing off the sweat from the most recent event. Jacob would often linger sometimes for an hour just enjoying the warmth of a warm shower room. Gregor, one of the competitors who'd just been eliminated, joined him. It was clear that the horse was frustrated. Both professionally and...sexually. An innocent question of whether he could help a bro out and before he knew it he was on the wall of the shower losing his anal virginity to the horse's massive cock. It wasn't what he expected...but he also didn't fight back. If anything, he moaned harder than he'd ever done for Jessica. The orgasm that had racked his whole body had come paws-free and multiple times as the horse had made feral love to him. 
	After the pair washed up, the lion was left with a litany of unanswered questions that the Gregor wasn't interested in helping him answer. He was a fucktoy - nothing more. And Jacob hated that he loved that. 
	Jacob became conflicted. He'd cheated on his girlfriend. With a guy. And he wanted to do it again. For the next few months, he fantasized about it. He made innocuous comments to other men in the washrooms as he'd done with Gregor, hoping that lightning could strike twice. But men, as it turned out, were not that perceptive to subtle comments, and he would feel too guilty to overtly ask someone to fuck him. It had happened by accident the first time and he hadn't asked for it...not intentionally.
	His curiosity became more active and the lion found himself seeking gay porn. It was an experiment, right? It's not like he would like it, right? He just had to get it out of his system. He was, predictably, very wrong. He went down a deep rabbit hole, clicking on videos that were more and more extreme. 
	Jacob's initial foray led him into discovering his desire to be fucked by men...and the larger the better. He almost wished he wasn't so tall and strong so that he could more easily find that. The initial desire to just have sex had transformed through years of fantasizing into erotic scenes of humiliation.
	But his physical abilities were the only thing keeping his relationship with Jessica going and keeping food on his and his little brother's table. While they were still friends, Jessica had noted his reluctance to get into the bedroom and to finally pop the question. She wanted kids one day and she wanted them to be their kids.  
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	Todd's recent struggles had primarily been in managing his envy of his brother and despair for his own situation. He'd fallen madly in love with Jessica. He saw how hard she worked to make his brother's and her relationship work. Meanwhile, Jacob seemed to just act like her friend.
	Puberty likely had a lot to do with his woes. He'd never seen Jessica as his mother or sister. When he'd started growing his mane, he also started to become sensitive to her pheromones. If it wasn't love, it was at least lust. 
	But she just saw him as a kid. A diaper-wearing kid no less. It was rare that he needed the protection. Or so he claimed. Accidents at night were almost guaranteed and he still couldn't hold it for long enough that they could trust him on car rides longer than an hour to keep himself dry.
	Life wasn't fair. No matter how much he trained himself, he could never seem to get over his bladder weakness nor get much bigger in general. That also said nothing about his size in other departments. His penis wasn't much to look at. In the locker rooms, he'd always get made fun of for the small sheath and grape-sized orbs between his legs. 
	As for his trimmed mane? Jessica wasn't unaware of Todd's fascination with her. And she knew that he sneaked peeks at her. She'd read that trimming male lions' manes made them less likely to act on their instincts. 
	Jessica also made sure to emphasize his diapers and his size, often referring to him as "Toddy" or "baby brother," instead of Todd, which he hated. It wasn't to demean him, but rather to detract his attention. She'd even tried to convince Jacob to let her put Todd in a chastity cage or use puberty blockers just until he got over her, but the older male convinced her that it might impact his already stunted growth.
	Todd hated this treatment, but would always rebound back to forgiving her. As for his relationship with Jacob, it was complicated. He was envious. But he was also appreciative that his brother would always take his side even when that meant annoying Jessica.
	His relationship with his older brother put him in a strange situation then when he went to investigate the smell of male hormones leaking from his brother's room to see him naked for the first time. At first, his eyes were drawn to the action on the screen. Porn? Sneakily, he watched and slowly realized that the skinny lionness being plowed by the larger wolf wasn't a lionness at all. Gay porn? But Jacob had a girlfriend. 
	Then Todd's eyes were drawn to his brother's crotch. It was the first time he'd seen Jacob's penis and Todd winced as yet another piece of pride was chipped away at. It was enormous. Even between the lion's thick legs, it looked big for his size. It had to be at least a foot long. But that wasn't the most shocking part. Unaware of his little brother's presence, Jacob stood up, revealing the matching pair of balls that dangled weightily between his legs. They began to bob up and down as Jacob seemed to be squatting and pressing something to his butt. 
	It was at that time that Todd realized that there was something in his brother's tailhole. A large black rubber circle was vibrating against the older lion as he pressed against it. Little gasps, and moans, and pants escaped not unlike the lion in the video. And without even touching his penis, Jacob let out a low groan and began to shoot copious amounts of his cum.
	Todd was floored. He escaped before his brother noticed but couldn't deny the growing desire that welled up within him. Feeling down to his crotch, he felt his hardened member tent in his diaper. Had he enjoyed seeing that?
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	As fate would have it, both of their problems would be solved at once. Someone was tired of waiting and found a solution of their own.
	When Jacob woke up he felt...damp. Was the ceiling always so high up above his bed? No, looking around, he was obviously in his little brother's room. He tossed the covers off, surprising himself as the thick and obviously wet diaper between his legs grabbed his attention. 
	No...wait...it couldn't be, right?
	He hopped up to his feet, feeling sluggish and weak as his body was taking far more effort than he typically required. Scrawny arms...no mane...his brother's wet diaper...he was in his brother's body! He scurried out of the room, more out of concern for his brother than anything. 
	Once he made it to the master bedroom room, he heard the sounds of a struggle. Not bearing in mind his current physique, he thrust the door open. Jessica had her legs in the air and what was once his body was fucking her with wild abandon. 
	He wanted to cry out and ask for an explanation. He wanted to make sure that his brother was alright or whether that was even him. But all of that started to fade while watching his former body. Had he always been so...hot?
	Todd grunted and kissed the woman below him as he shot yet another load into her. How many times they'd gone at it this morning, he couldn't even count. He had never even processed that he had swapped bodies, so lost was he in the throes of pleasure immediately upon being woken up by the object of his desire.
	Jessica called out "Fuck...fuck...hold on..." as Todd began going for another round. If it had been the first or second time, she doubted that she would've been able to stop him. But they'd been having sex for the better part of an hour and while she'd enjoyed herself, she needed a moment. And Jacob walking in on them was the perfect timing to get that.
	Todd withdrew and allowed her legs to gently rest back on the bed and Jacob watched in awe as that massive cock revealed itself slowly, leaving a river of cum as it vacated her sex. Jessica panted and planted a delicate kiss on Todd's forehead which he tried to reciprocate with his maw, but she deflected, pointing to Jacob. 
	The lions' gazes met and the dawning of what had transpired really sunk in. Jacob had just been cucked by his little brother. But rather than be focused on that, both were still uniquely focused on their own lust.
	Jessica made her way to Jacob and smiled. "This suits you much better," she said, patting the front of the wet diaper with a laugh. With a swift tug, that diaper fell to the ground with a thud, revealing Jacob's new tiny penis. On one knee, she drew her paw across her crotch, wiping the semen and her own juices to lubricate it as she proceeded to penetrate Jacob's rump. His moan told her all she needed to know. After removing her digitis, she guided him over to the bed where a very confused Todd remained.
	She drew closer and whispered in his ear, "if you do anal with him, you can do anal with me, next."
	Todd didn't need any more motivation. Without hesitation he began to press the head of his penis against his former body's tailhole. It wasn't going to go in that easily, though.
	Jacob whimpered. This was like a dream, right? He eagerly pressed his hole against that girthy penis, more than willing to take it, even if his body wasn't prepared and began mewling like a lionness in heat.
	Slowly but surely that cock began to find purchase inside of the smaller lion. There was no way he was going to hilt him, but any pain that Jacob was feeling was outmatched by the fruition of his fantasy of taking a penis from someone much larger than him. His tiny penis twitched beneath him and that teenage spunk coated the bed before Todd had ever really even begun to fuck him. But he didn't want it to stop. 
	Todd seemed to enjoy the moans, especially when he made them as feminine as possible. He was picking up the pace too as he felt his brother submit to him. Wanting to take full control, he moved into a sitting position, easily lifting his former body and allowing gravity to do much of the penetration for him. He watched in awe as Jacob seemed to take more of his penis than he ever expected that small body to be able to take. 
	Jacob didn't resist. He let himself be controlled and didn't try to hold back when his prostate roared in ecstacy, spreading micro-orgasms that dribbled and spurted cum uncontrollably with each passing minute.
	Todd too couldn't resist. The sounds were too much and the clenching around his newfound girth. Perhaps a little too forcefully, he pushed Jacob onto his penis, forcing him to nearly hilt and cry out loudly. Despite having cum many times prior, he felt his semen coat his brother's insides, leaving both of them panting and wanting more.
	Wincing in pain, but bearing through it, Jacob asked, "again?"
	Todd nodded and slowly began to hump.
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	It wasn't permanent. Or so Jessica claimed. She just wanted her litter of kittens and then she would change them back. Both boys knew that she was already pregnant, but weren't in any hurry to swap, so they didn't ask how she did it or how she planned on swapping them back.
	Todd liked having muscles. He liked not waking up with a wet diaper. He liked getting to have sex with the woman of his dreams and knowing that he was the reason why they were going to have cubs. 
	She still loved Jacob. But she'd always known he was gay. It was selfish of both of them to pretend otherwise for so long. This was an arrangement that still kept Jacob in both of their lives while still letting Todd get some of what he wanted. But she wasn't without her own goals.
	Now being in the body of her formerly pesky baby brother, it was much easier to get Jacob to agree to the chastity cage. To the hormone blockers. To the mane shaving. The hormone blockers was having an adverse affect on his ability to keep his pants dry far worse than Todd had ever had to deal with. It worked out for her - Todd was motivated to change Jacob's diapers because of the cubs that were on the way and Jessica wasn't going to complain about having another set of paws to help with that. 
	The trio would spend most nights together where Todd was the only common denominator, wielding his brother's body in ways that Jacob had never dared. 
	She would inevitably change them back...once she had them both trained.