Several minutes after Jack took the pill, small tingling sensations sprouted through his body. He paid it no mind, just assuming the pill made him drowsy or something. Small patches of brown fur slowly spread throughout his body, making him feel warm.
Jack laid back on the couch, continuing to watch TV. With him distracted, the changes happened without him noticing very much. The fur almost completely covered his arms and legs, his hands and feet webbed. It took him another minute to realize something was wrong.
When Jack looked at himself, he screamed upon seeing the dark fur covering his body. He threw off his shirt, seeing that the fur was crawling up his torso at an alarming rate. He panicked, yelling, but it quickly turned into a moan as the crotch region of his pants outstretched, struggling to contain his involuntary erection. "W-What is this? Why does it feel so....good...?" Jack ripped him pants off his body with his new claws, showing the entire region below his waist covered in soft brown fur. His balls were grown to almost the size of watermelons, his own erect shaft sporting a size bigger, wider, and thicker than his forearm. It constantly dribbled pre like a faucet, drenching his sofa in seconds.
He couldn't help himself. Jack touched his giant cock with one of his new paws, which he moaned and it spurred out a wave of precum in reaction, making a puddle on the wooden floor of his house. "This is...This is amazing! Why did I ever hate furries? This is awesome!!" He slathered his remaining open human skin with his own otter precum, hoping to speed up the process, which it did. A long rudder-like tail bursted out from over his ass, thick and strong. As the fur covered Jack's face, a short muzzle grew out, a cute black nose and smile adorning his face. His brown hat blended with his new brown hair as his ears moved up to the top of his head. While most of the fur on his body was brown, all the fur from his muzzle to the tip of his tail was some light cream colored fur. Jack had been fully turned into a sexually endowed otter, ready to fuck.
He stroked his newly furred body, purring as he posed to himself in front of a mirror. He smirked, reaching down to his still throbbing meat and began pumping it like crazy. Jack quickly reached his breaking point, moaning in pure ectasy as he had unleashed a torrent of cum, completely coating the mirror and the wall behind it, all dripping to the floor. Despite all this, his cock still dripped pre, ready for more. "...I'm the sexiest creature alive...!"
Just then, his doorbell rang. He immediately knew what it was. Several hours ago, he had ordered pizza. While it infuriated him the pizza only arrived now hours after the initial order, he smiled as he thought of a devilish plan. He approached the door, hearing a male voice behind it. "Hey, um, I have an order for...a jack? I think that's how these orders are done, anyway...Your food's here if you want it."