The day started like any other. Joe was a well built 18 year old young man. Life was going pretty much perfect for him. He was the star of his high school foot ball team and was going steady with his modest girlfriend Sam. At 6' 1" and 205 pounds he was the envy of every man at school at least in his mind. He was a bit of a narcissist but then who wouldn't with this body of his. He himself was going to a good college in about a month, riding on his sport's scholarship. Joe finished his weight lifting and was lying on his bed wearing a wife beater and sweat pants. It was about time for his daily jerk-off. "Best time of the day," he said to himself as he brought his pants and boxers down to his upper legs. It unleashed his dick which was a good foot or so erect and thick as a beer can and 8 inches limp yet still thick. "What would I do without you buddy?" Definitely a narcissist.
He started. "Oh yeah.... Ah, Ah, Ah... Oh myyyyyyyyy!" It felt even better then it usually did. He stopped. He needed to savor it. It felt really hot in his room as he wondered what could be the cause of this sensation. He heard footsteps. "Shit... the little twerp is here!" Joe brought up his pants and even that felt good. He covered himself with the sheets to keep who was coming from seeing his wet pants. And out came his 8 year old little brother, John. He himself was only 3' 10''. He was about the right physic for his age, a little on the skinny side. Obviously Joe doesn't know his dick size. "Whadya want, Johnny?! I'm busy." "Can you turn on the air conditioner in the living room. It's hot." The two brothers were alone in the house, so obviously John had no one to ask. "Can't you wait? I wanna finish... my adult thing." "But I'm so hot!" "Sigh... Fine. Go get a water bottle to hydrate yourself too." He at least didn't want John to see the wet spot near his dick so he asked to get John away from the living room. "Thank you!" John said as he ran to the door. "Yeah whatever pipsqueak."
Suddenly John stopped moving. "What?! Get a move on!" Joe yelled out. He was starting to get annoyed. "Um.... Wha?! Ah!" John was making weird sounds now. "Joey! I... I can't move..." John turned around as he said this. "Jesus Christ! Is it something I said?!" John sometimes like to kid around, but this was really a bad time. John moved forward. He was starting to cry. "No... My body... moving... I'm scared." "Hey..." Something was wrong here. Suddenly Joe felt a chill in the air. He looked to his front and noticed his sheets were off his body exposing his pants. "Wha...?" It was almost like he threw them off himself. His feet moved and he started to get off his bed, but not by his own will. This was no joke. Joe stood up and he started to move towards John. "What the fu... What the heck?!" "Joey!" John started to cry even more. His hands moved to his shirt and he took it off. Joe did the same. And they did the same with their pants and socks. Joe's boxers were the next to go exposing his leaking dick to his young innocent brother. "Oh my god!" Joe was freaked out now as he looked toward John without his underwear on. He could get a look at his penis now. "Joey! What's going on?!" "I... Holy crap!" They then passed each other, where a spark was felt between them and turned around and that was when the truly weird stuff happened.
Suddenly Joe started to thrust. "What the hell?! Ah,ah,ah,ah,ah,ah,ah,ah,ah,ah." Joe watched in horror as dick seemed to be jerking off by itself. "Oh boy! Oh god!" "Joey!" John had no idea what was going. "Ahhhhhhh.... Ahhhhhhhh. John! Move! I'm gonna.... Ahhhhhhhhhhhhhhhhhhhh!" But it was too late. Joe started to ejaculate all over hitting John. "Ew,ew,ew,ew!" John felt the warm liquid spill over his body. It went on for a good minute. When it stopped, Joe's dick went flaccid. "John... Oh god!" Joe felt exhausted like he cummed his whole body out. John was still crying. Then it happened. The cum started moving converging on one place: John own dick. It was going inside. "Ahhhhhhhhhhhh!! My pee pee! It hurts!" "Fucking hell!" Joe was in disbelief with what was happening. He watched in what could only be described as awe as John's dick grew. His balls getting bigger.The cum was filling it out. Joe looked down and saw his own dick was little. "Shit, shit, shit!" "Joey. I feel funny! Help!" John dick looked like Joe's now and the opposite was true for him.
The weirdness continued. John's feet were growing, becoming callused as Joe's did the opposite. They just looked at each other now. They were in too much shock to react anymore. John's started moving up as Joe felt himself moving down. John's legs amassed muscle and some hair. Joe could see his legs lose his muscle and hair. Their pelvis started to change to accompany their new dicks. John felt a burst as he bulked up with eight pack abs and pectorals to suite. His arms felt heavy with new muscle as well. Joe's eight pack was slowly dissolving. His pecs becoming flat and a little chubby. His arms, which could lift unimaginable weight, were no longer his. So were his hands. Joe watched as his own little brother's hands became prime masturbating material. Then another pain hit. "Ughhhhh! My face. Holy fucking crap!" "Joey! Wahhhhhhhhhhh! It hurts, it hurts, its hurts!" The pain soon subsided as to two siblings felt lightheaded and spacey. Just then the heat subsided drastically signaling the end of the transformation. They both fell unconscious, but they were now each other.