Alex gasped and tensed up as an electric buzz vibrated his butt. The otter had forgotten to deactivate his portal panties when he left his home, and now someone was on the other side, ready to take advantage of that fact. Usually, he welcomed the extra income from selling his butt online, but this time, it couldn't have happened in a worse spot. He turned around and tried to stumble out of the crowded streetcar, but the doors were already closing, and a dozen other passengers blocked his path, trapping him between their sweaty bodies.

The otter almost fell over and barely managed to clutch the nearest paw handle as the vehicle began to move, but that jolt was nothing compared to the sensation that overcame him just a second later when the male at the other end of the portal claimed his ass. Time slowed to a crawl as the narrow tip poked his clenched pucker, and Alex barely got time to loosen up before the client shoved his cock inside him, stretching his butt asshole open within a single determined thrust.

As advertised, Alex was always lubed for his clients' convenience, but no amount of lubricant in the world could make up for the fact that the guy on the other side was hung like a stallion. Tears welled up in the otter's eyes, and a strained grunt slipped through his gritted teeth as the massive schlong invaded him. He hastily pressed a paw onto his muzzle and muffled himself, but luckily, none of the other passengers had noticed his distress, and the slurp of the initial penetration dissipated in the loud noise that filled the chock-full streetcar.

However, this was only just the beginning of Alex's predicament. The first thrust was immediately followed by more, and his client's shaft stretched him wide open, again and again. Fresh bursts of stimulation flooded his mind as the fat cock squeezed his pleasure bulb, and with every thrust, it became harder for him to suppress his urge to moan. His paws cramped up, and he bit his tongue as his body heated up with arousal and pleasure backed up in his brain with no valve for release. Instead, the almost unbearable thrill of his situation made him pop the hardest boner he had ever had.

However, the bulge in the otter's shorts was nothing compared to the bulge that slid its way up and down his abdomen. His client was as big as he felt, distending his guts so much that the outline of his tapered erection was still visible through the fabric of his loose muscle shirt, making it shake and flutter with every movement. The sight drew a stunned squeak from Alex's lips. This time, his voice didn't fade away unheard. The ears of a few other commuters flicked and tilted his way, and even worse, one of them turned around and looked right at him.

Alex froze like a deer in the headlights as a huge bull in a dress suit scrutinized him with a raised brow, piercing his body and soul for an eternal second before turning around and leaving him be again. Still, the brief glance felt like an eternity and sent the worst shiver down his spine, making the otter hyper-aware of the people around him. Countless eyes and ears were ready to pick up and judge his every action, while the male at the other end of the portal mercilessly ramped up the speed, showering him with overwhelming, heavenly pleasure he was forbidden to enjoy.

His skyrocketing arousal made Alex even more receptive to the murmuring, meandering voices, the creaking of the vehicle, and the rustling of clothing enveloped him and masked the telling shlorping and shlicking that emanated from his loins. The sweaty musk, floral perfumes, and fresh deodorizers of the other commuters mixed together into a potent concoction, fueling the powerful tingles that ravaged his body with each of his client's thrusts and infused his brain with horny fantasies. Wherever he looked, he noticed fat bulges and tented pants. Plenty of big hunks and muscles to pin him down while the males on the streetcar took turns on him once his client was done. All of them.

At that moment, a soft buzz against his butt cheek reminded Alex of his cellphone, and he realized there was still a chance to pause the ride before it got too much to handle. He hastily reached for his back pocket and fished out the device with shaky fingers, only for a sudden jerk of the streetcar to tear it from his grip and send it flying. He winced as his mobile slammed into the ground, but he hastily bit his tongue before the annoyance in his voice was corrupted by his lust.

Bending over to pick up his phone was almost impossible for the otter because his client was still ramping up the speed, hammering his tight ass with ever harder thrusts, but for better or worse, he wasn't the only one who had noticed the mishap. A young gazelle had also turned around and picked up the device, offering it to him with a smile on her lips. "Here! I think you accidentally dropped this."

However, the female's smile faltered as she laid eyes on the struggling, shivering otter, and her brow furrowed in concern. "Uh, are you alright? You look like you're having trouble."

Alex tried his best to turn his grimace into a grin, shaking his head to dispel her worries before she could jump to any conclusions. "Y-yes, I'm a-alright! Just... ugh stomach cramp," he grunted, sluggishly reaching for his phone. Fortunately, he was bent over, so she couldn't see the telling bulge on his belly nor hear the wet smacking noises from his butt. "Eaten something wrong... on my way to doctor. But thanks."

The gazelle cocked her head, clutching the cellphone for another second before she yielded it to the otter. "Okay then. You're welcome, and take care."

Alex nodded with a strained smile and remained hunched over until she turned away. However, among the merciless thrusts, he had no time or mental capacity to feel relief about it. Instead, he activated his phone and checked the hookup app he used for his naughty portal endeavors. As expected, he had received the notification that someone had taken him up on his offer, and by the looks of it, the guy on the other end was a big, beefy gray wolf, putting a face to the fat canine cock that was currently rearranging his guts.

Next, the otter clicked on a stylized speech bubble at the bottom of the page to open the chat. A few quick-select options popped up, and his finger instinctively hovered over the stop button, but he hesitated when something new pressed against his butt. The wolf's girth was expanding at the base as his knot started swelling, indicating that he was rapidly approaching his orgasm. At the same time, a number at the top of the screen caught Alex's attention. Golden digits proudly displayed his compensation for the romp, and it was enough to make him pause again, wondering if maybe the money was worth the risk.

Alex tried to make up his mind, but the wolf's rutting kept messing with his thoughts, and before he could come to a conclusion, his client settled the matter when he finally buried his fattened knot with a loud pop.

The otter gasped and went cross-eyed as the massive bulge grew even bigger inside his ass, crushing his prostate and showering him with pleasure, and not a second later, a wet warmth spread through his belly as the first spurts of thick lupine seed flooded his guts. He quickly learned that his client wasn't just hung but also had a pair of nuts and an output to match his size, and he got filled to the brim in no time. The stuffing also didn't end when there was no space left. The wolf's orgasm had only just begun, and his thick knot ensured that every last drop ended up inside him, the relentless flood swelling and inflating his belly with ounce after ounce of hot, potent semen.

While the hung wolf bloated Alex, the voice of the streetcar's announcer rang in his ears, and he noticed that the vehicle had come to a halt. They had reached the next stop, and as the doors opened, the otter realized this was his chance! However, his sensitivity threw a wrench in his plans because the moment he turned around and rushed toward the exit, all his pent-up arousal unraveled in a sudden flash, triggering a long-overdue orgasm and catapulting his mind into the stratosphere.

The overwhelming climax instantly caused the otter to lose control over his body. He stumbled and fell to his knees, just managing to break his fall with the calves of two other passengers before he burst into a deep, horny moan. His voice vibrated with the pent-up lust and pleasure of the entire pounding, and suspended in the mighty high, he got to enjoy the utter relief for another moment before harsh reality crashed down on him, and he realized what had just happened.

Suddenly, Alex felt everybody's eyes on his hide. The other commuters shot judging stares and confused looks at him, and even worse, a few of them had a knowing smirk on their lips as they ogled his wobbling cum belly and the growing damp spot on his shorts. Thankfully, his orgasm distracted him just enough from crushing embarrassment to get up and stumble out of the streetcar before it could trap him in hell. 

Holding his sloshing, swelling belly with one paw, the otter continued to totter all the way to the station's railings and unceremoniously slumped over it, toppling into the bushes to hide himself and his situation. 

With no more prying eyes to expose his debauchery, Alex sighed with fleeting relief before the wolf's throbbing, pulsing cock grabbed his attention again. By now, the other male's orgasm had turned his belly into a fat, sloshing dome of warm, creamy goodness, and the fun was still far from over. "Fuck, why did you manage to pick the absolutely worst time to bury your knot?" he groaned and checked his phone. At least, his mishap had a thin silver lining because his client had given him a hefty tip. "But thanks..." 

With an exasperated sigh, the otter put down his phone again and leaned back against one of the bushes, rubbing his growing belly with one paw and unzipping his shorts with the other. Then, he grabbed his cum-soaked, still rock-hard dick and began to jerk himself to another orgasm, trying to drown the shameful memory of his fuck-up with even more pleasure. Besides, he had nothing better to do anyway while he was still knotted, and his groceries could wait for now.