Jeff saw the package sitting on the porch when he got home, got out of his car, hurried up, got it, and took it inside. He’d been waiting weeks for it to arrive, and finally, it was here. He put it on his table, opened it up, and hauled it out, turning it over in his hands, already wondering if his eyes had been bigger than his stomach, or his ass, rather. It was a custom dildo from a fellow who called his creations “monster cocks”–each one was one of a kind, and while he didn’t charge for them, getting your hands on one of them was hard as hell. The creator took applications for his work, but who received them always seemed a bit random. He said that his toys chose who they wanted to own them, but after trying for most of a year, Jeff had finally been chosen, and now, it was in his hands.
It was in his hands, and the thing was massive. Far larger than anything he’d ever taken before in his life. He had a modest collection of dildos for when he didn’t have anyone around to fuck him, and he’d always enjoyed it. Some guys he knew had suggested he start training to take a fist, and he was close to that at this point. This dildo though was thicker than most guys fists, and easily a foot long. The dildo’s skin was a dark brown mottled with tan up the shaft to the head, which had a sheath, or a foreskin, bunched up around the glans of the cock. He toyed with it, and saw that it was actually rather elastic, and could stretch over the head, even, giving it more of a sheathed look. The base of the dildo included a set of substantial balls, the sack the size of a small melon. The sack and the bottom third of the cock was actually covered with hair–running his hand over it, he couldn’t quite tell if it was real or not. It had to be synthetic, but it felt a bit like soft boar bristle–he wondered what it would feel like on the inside of his hole–if he could get it that far in, even.
Jeff tried at least. Got himself cleaned out and lubed up, warmed up with the largest dildo he had, and then gave it a go. He was just too tight–he couldn’t even get the thing in past the head. He felt demoralized, got cleaned up and onto his computer, where he saw a chat message from the dildo maker.
“I saw that the package got delivered, just wanted to make sure everything got there alright.”
“It did,” Jeff replied, “It’s bigger than I thought it would be. Don’t know when I’ll be able to take it.”
“Don’t worry too much about that. It’ll get in you faster than you think, just keep trying. I know this is the right one for you, it won’t be too long at all.”
Jeff wasn’t sure of what to make of that, but he poked around online, looking for a dildo to train with larger than the ones he had, but smaller than the monster cock, but all he could think about was the beast waiting for him upstairs, and how much he wanted it inside him. It was getting late, and he had work in the morning, so he went to bed. His dreams that night were intense, and when he woke up he couldn’t recall much of them at all, aside from a strange sensation of being stalked. That, and he woke up with the monstrous dildo in his arms, when he was certain he’d left it in the drawer with the rest of them before bed. Confused and a bit bewildered, he went to work, but found it more and more difficult to focus. At first, it was just because he was tired after his restless night, but as the day progressed, he found himself thinking more and more about the dildo waiting for him at home, and he rushed home so he could be near it again, feel it again, lube it up, and once again try and fit it inside him.
That day, after an hour, he finally managed to get the head inside his hole, and that alone was a revelation. It was a sign of progress, and Jeff kept working at it, sweating and grunting, until he was too starving and shaking to continue. He went downstairs, found a couple of steaks he’d been saving in the freezer, and cooked them both, not caring they were rarer than usual, he was just starved. He considered a shower, but felt too tired to bother, and simply went upstairs to bed, curling up around the dildo without even thinking about it. The dreams that night were no clearer, but he woke with a groan, rutting his own cock against the dildo, the sheets under him soaked with sweat and cum from what must have been a very active night. He pulled himself together as quickly as he could, not even bothering to shower, but when he headed for the door, he struggled. He couldn’t…leave it here. He bundled the dildo up and took it with him not quite sure what he was doing, but it felt instinctual. He managed to leave it in the car for most of the day, but found himself terrified someone might see it, or worse, steal it. On his lunch break, he went down, retrieved it, and struggled to resist the urge to take it out and start riding it right there in the office. He settled for taking it into the bathroom with him, licking and sucking on the head while he jacked off, horrified by his loss of control, but still unable to stop.
It was when he got home, that he noticed something was off. He hadn’t really bothered looking at himself in the mirror that morning, but in the bathroom, ready to clean himself out and try again, he saw his reflection, and just stared. He hadn’t been that hairy before, or that muscular. It wasn’t…much, really, but it was there. His clothes didn’t quite fit right, which explained some of his discomfort the day before. His beard was thicker, and when he lifted an arm up in the shower, he caught a whiff of his musk, and that was more pungent too. He didn’t have time to shower though–he hosed out his hole, skipped the soap, and was back in his bedroom, riding the dildo again, working it deeper, inch by inch, now sliding halfway down the shelf.
He could almost feel it…throbbing inside him, trying to wriggle deeper. He couldn’t tell if it was real, or if he was just imagining it. The idea of it was so hot, though, that he kept shooting load after load of cum all over his bed and his sheets until he collapsed again, too exhausted to move. It was nearly midnight, he’d been at it for hours. He had to piss, but was too weak to get up from the bed. He released it onto the bed under him, horrified at first, but the scent of it satisfied some deep, primal need inside him, and sleep took him soon after.
The next day, he got up from the bed, sniffed his hairy pit, and before he even really realized it, he was pissing all over the carpet and the wall next to the bed. Part of him was concerned, but it was much quieter than it might have been usually. Instead, he hauled out his cock and jacked off as well–it was the only thing on his body that wasn’t larger, all of a sudden. He squeezed his way into some office attire as best he could, no longer certain why he was wearing this, why he was bothering with it. He had more important things to concern himself with, after all, but some part of him clung to that normalcy, tried to deny the drives and desires that were well on their way to overwhelming him.
He didn’t last long at the office that day. He kept sneaking away to the bathroom to masturbate, to worship the dildo, his cock, his monster cock, as he kept thinking about it. Each load that he shot did nothing to calm him down, it only seemed to drive him to more intense heights of desire. When he stepped out of the stall shortly after lunch, and saw the one of his burlier coworkers at the urinal pissing, maybe it was the smell, maybe it was the sight of his ass filling out the back of his slacks, but he went over, shoved the man up against the urinal, and rutted against his ass, grunting and snorting like some animal. The man managed to get away, and before security could get a hold of him, Jeff fled the office with the dildo, abandoning everything else, and sped home.
He wouldn’t go back there. It wasn’t safe. He was safe in his home, in his den. He had to finish, he had to fuck himself with his cock, with his monster cock. He threw himself into the task, he was so close. The dildo was warm now, he could feel blood pulsing through it, the hair no longer synthetic, but so close to the hair that beginning to sprout all up and down his own body. He only had a couple more inches to go, and He worked at it, pushing everything else out. Every time he shot a load of cum, he realized, the dildo would slide in a little deeper. His body was getting larger, yes, but he noticed at last that his balls were shrivelling, his cock dwindling. At long last he took the dildo to the hilt with a roar, and felt the monstrosity come alive, the entire thing digging deeper, screwing into his guts, his wrecked hole closing up behind him.
He felt it push out, forcing its way from his body, his human cock stretching and ripping apart as his new, monstrous cock erupted from his crotch, his massive balls coming through last and dropping, slapping against his hairy thighs. He could feel it, his new cock pumping…something through him, changing him. His teeth, already sharper than they had been, grew longer, into proper fangs, is mouth and nose distending into a furry muzzle. The hair that had been growing thicker on his body became a thick pelt of black fur, hands becoming paws with thick claws on the end, his whole body filling out with layers of muscle and fat, until he was nearly eight feet tall and close to seven hundred pounds of pure mass. He looked at his monstrous bear body in the mirror, cock throbbing and leaking, and that was the last thing he recalled clearly, as he wrapped his paws around his cock and kept stroking, kept pleasing his cock, a slave to his new sexual desires, no longer interested in anything else.
When he awoke, his body had reverted–somewhat. His room was wrecked, as were several of his doorways, but he hadn’t managed to make it outside at least. That didn’t matter now. All that mattered was what his new cock desired–and it wanted a hole to fuck. There was a knock on his front door, and much to his surprise, there on the doorstep was his old coworker from the bathroom, the one he’d rutted up against. He was shaking and sweating, muttered some excuse about needing to see him again, but Jeff knew what the man needed. He grabbed him by the collar with his clawed hand and dragged him inside, shoved him down to his knees, and pissed all over him, marking the man as his new property, or rather, the property of his cock. It would take a while to open this one up and fuck him properly, but he had no doubt that in time, he would be a perfect slave–and when he took him to the hilt, and filled him with a load of his corruptive cum, he too, would turn. He shook off the last bit of piss from his cock, and dragged the addled and horny man into the bedroom now reeking of his scent, threw him on the bed, and went to work.