Derek flopped down into the stuffed chair that sat by the window in his room. This was already proving to be a boring place to live. Thank God it was only for the summer. He'd be back for his senior year of college come fall, and then he could make his own way in the world. IT was Ian he worried about, his bi little bro probably wouldn't fit in well at his new high school which would no doubt be filled with rednecks and cowboys.
He pulled out his lap top and started it up. At least he could amuse himself with.. no. He couldn't. There was no internet set up in the house yet. They weren't coming out for a few days, and it was too late to go into town to explore. Instead he dug down into his hidden folder and brought up one of his favorite porn videos. There was always one way a young man could relieve a little boredom.
He pulled off his shirt, tossing it aside before he put on his headset and opened up the fly of his jeans, fishing out his cock. It was a good cock, too. A solid six incher, thick and veiny. It wasn't the biggest, true, but it was more than enough to keep the girls coming back. And they didn't have to choke on it like they did with bigger guys. More than one girl told him it was the perfect fit. Not too big, not too small. He was proud of it.
He skipped forward past the weird intro, right to the part where the two women were laying in bed, with the guy between them, both women caressing his thick muscles. Derek hit play, laying back and pretending he was the guy between the two women. He ran one hand over his chest as he starting pumping his tool with his other hand. His attention completely on his screen and himself he didn't even notice the stallion staring at him through his window, or the slight red glow in its eyes.
Derek must have been pent up. His cock was practically burning up in his hand, pre already dripping down over his cock, making it nice and slick for his hand. Everything felt so.. sensitive. Too sensitive. He rubbed his pecs, rolled one of his nipples between thumb and forefinger as he watched the screen transfixed. Moans echoed in his ears as one woman rode the guy's cock, the other straddling the guys face as he ate her out. He didn't notice his fingers being forced apart, or that he had to move his arm up and down quite a bit more to cover the whole length of his cock.
He arched his back, thrusting his cock into his fist with the bucking of his hips. Both women were sucking on the guy's cock now, and Derek moved his second hand down to his cock. He didn't even think that he had never been able to double fist his cock before, his mind was hazy, laden with the bliss of having the best jerk off of his life. Sweat poured out over his chest and muscle gut, every hair on his body stood on end.
Then his cock exploded. It shot cum with a force he had never felt before. Derek's ass cheeks clenched as he fired ribbon after ribbon of cum into the air. His chest heaved in heavy pants as he caught his breath, the high-pitched over acted squeals of two women coming playing in his ears over his own grunts of pleasure.
He collapsed back into the chair with a heavy sigh. "What the hell got into me?" He wondered as he reached for something to clean himself off. He grabbed his discarded shirt, and then froze as he saw his cock.
That. Was. Not. His. Cock. Sure it was thick and veiny like his cock, but it was way too long. Still semi-hard it flopped against his thigh, it must have been at least nine inches and it wasn't even fully hard, and the head! It no longer sported the familiar mushroom shape at the top, instead the head looked flattened out and flared. It was weird and alien.
He stood up in shock, and felt twin slaps, one of his thick cock flopping against his thighs, and another of lower hanging pendulous balls slapping against his cock. His pants fell down around his ankles and he immediately tripped, taking a spill onto the floor with a loud thud.
"Keep it down up there!" He heard his father shout. Derek blushed, and quickly freed himself of his pants and stood back up. He took a quick accounting of himself. Other than his balls and cock being oversized and his cock being weirdly shaped everything else was normal. He just had to think. He lifted his head, which made him look right out the window into the eyes of the black horse. He swore they flashed red for a moment, but that couldn't be. Or could it?