Ty was quite surprised, and even a little pleased, to see that Dustin had grown into quite the stud. With his muscles, toned arms and thighs, and monster-sized cock, he looked much, much older than he actually was.
Dustin woke up to find his brother standing over him with a smirk on his face. He awkwardly tried to find something to cover himself, but then he thought about his penis again, and suddenly, it was hard and stiff and pointing straight up like a ramrod.
"Geez, you need to put that thing away before you stab someone with it."
"Shut the hell up, you little bastard. You did this to me! Go find me some new clothes!!!"
"Fine, but first we need to get rid of your little friend. Stand up."
Dustin did as he was told, but didn't realize that Ty would then grab his cock and start stroking him. "For fuck's sake, you're my brother, let go!!" But Ty kept stroking, and Dustin finally gave in. He shot a thick load of thick white semen all over the wall, but his cock was still as hard as before by the time he finished.
"Shit. I'd better block the door. We're gonna be here for a while."
Ty used every trick he could think of to get his brother's erection under control: using hand soap as lubricant to jerk him off more quickly, dousing him with cold water from the sink to reduce his sex drive, wrapping his cock in toilet paper to soak up his fluids, but eventually he just settled on getting him to cum over and over until he didn't have a drop left in him. After filling up all the trash cans with cum-soaked paper, they moved on to the urinals, flushing as much as possible. But nothing made a difference. It seemed that every time Dustin came to climax, it lasted longer and produced thicker, more pungent semen. Dustin himself felt that his cock and balls kept swelling up and getting bigger. No matter how many times he came, he never wanted to stop.
Ty had only one realistic option yet, and it was the only one he swore he'd never cross: sucking Dustin's cock. He comforted himself with the thought that it was the only way to help his brother, and that he deserved it for putting Dustin through this. He swallowed whatever reservations he had and started by licking the head of Dustin's cock before slowly working the rest of it in. The blowjob lasted only a few minutes before Dustin came, and his semen was so thick by this point that Ty nearly choked on it. He only swallowed a little of it while letting the rest dribble out all over his clothes, forcing him to take them off.
The naked brothers sat with each other for some time, as they were still trying to process the fact that they had committed incest. And the worst thing was, they liked it. Dustin loved the feel of Ty's warm mouth around his cock, sucking out his cum. Ty found the taste of Dustin's penis irresistible and his semen warm and tangy, like microwaved pudding.
They looked at each other hard. There was no going back if they continued.
"Ty?"
"Yeah, Dustin?"
"Do you want me to fuck you?"