"Oh man, that felt so good, big bro" Andy murmured. He smirked and looked over his new pecs at the drooling cock as it popped out of Jesse's asshole. His 9-incher was still pulsing from his intense orgasm and it was so big he wondered how he could even fit inside of his brother. He didn't care though; that felt fucking hot! And his brother deserved it for always barging into his room like he owned the place.
Andy had only begun learning about his sexual side before visiting Madame Illusia, which often included jerking off late at night and stifling his moans of pleasure to avoid waking anybody. But this was entirely different. Andy didn't understand why, but after the circus experience with the dick swap, his body was growing at such a rapid rate to match his older brother's former physique. He would sweat profusely after a little bit of physical exertion or during his sleep, and would strut around home after playing outside with dark spots around his pits and neck of his shrinking shirt. Jesse feigned annoyance the first few times and attempted to still boss his little brother around. He stopped once he realized he had to look up at Andy's face, still young and childish yet placed upon slightly-built shoulders and traps. The pectoral muscles, however, looked more like 2 basketballs on his frame, and Andy could only grin as he realized they were getting even bigger. On top of that, he realized his smell made Jesse act weird.
"Aaauuuwww..." Jesse groaned from underneath. Andy's attention snapped back at his pinned brother. Jesse's face was twisted in pain underneath the cum shower from Andy's first orgasm. He was no longer trying to struggle out of exhaustion. But his distended belly gurgled in defiance and his hole was clenched shut.
"What's wrong? Can't handle another round?" Andy grinned at the sight. His older brother and bully, now completely dominated and used, was making his thick rod harden again. Damn! Did Jesse have this much stamina before the switch? Andy then remembered the long weekends he spent when the parents were away, holding a pillow to his ears as his jerkwad of a brother "played" with Karen for hours. He didn't know what they would be doing that would make them roar and scream because Jesse threatened to pulverize him if Andy bothered them or peeped to their parents, but now he had an idea of what it might've been.
Despite his cock chubbing up again, Andy felt a wave of sleepiness catch up to him. After all, he still had more growing to do. Andy took one arm off of Jesse to cover his yawn, then the other as he lazily rubbed his slicked and hefty prick. "I think we should save some fun for tomorrow. I'm getting a little-" he yawned again, "-tired."
Andy flung himself onto the bed, the shock making Jesse bounce and wince. He laid face-down against his pillows (his chest had grown so big he needed more than one to rest his head) and wrapped one pumped arm around Jesse's skinny torso. His legs hung off of the bed but he didn't care. Within moments, he was fast asleep.