I go in the laboratory and a black boy came running towards me.
"Oh big brother, we swap? He please do!" He said.
I think about it two seconds and agree. I look behind me, Gavin and Jennifer are out of sight. Flash! Now I'm Marius, 15 yo, Gavin's younger brother. He is tall for his age but thin, he has an afro and a basketball jersey. Wow, 15, here I am a kid! Marius, now in Gavin's body approached me.
"Thank you, I'm the big brother now. From the time I envy your muscles. Hopefully you're not in a hurry to retrieve them"
We laugh. I tell myself that I do not care, this is not my body, but I leave it with some regret. I loved being Gavin.
"Do not forget that I've basketball training in ten minutes. My locker code is 1234" Marius tell me.
Leaving the house I see Gavin stop his former body inhabited by Marius.
"Well we do this swap!" says Gavin thinking it's me.
"Hey, I just got it, I will not give it to someone else," replied Marius and then goes away.
"Is this a joke?" is astonished Gavin that will have to wait before returning itself.
I really want to see Marius' life so I take the bus to the school. I'm late. I change quickly in the locker room. I take a look at my new appearance. This is a very dry body, not too fat and not muscle. But he has a beautiful cock. I start to get hard and I see it taking a curved shape to the left. Hey funny. I pack it and I run on the field where I met the basketball team. I know some people. During the game, I feel that my body is used to it, I have the feeling to play a good way and scores. After the training we go to the locker room and a teammate told me that I was not very good today. Ah, ultimately I've not inherited Marius's talent. Then we go in the shower. I try to keep calm thinking about something else. Suddenly I feel a hand caressing my ass. I turn around and do not see who touched me. Perhaps the red-haired boy there. When I get out of the shower, someone shout "Soggy biscuit". I had heard about it but I had never played it. A boy upside down a bucket in the middle of the locker room and puts a biscuit on it. The whole team gets around the bucket and I join them. Everyone his dick in his hand.
"3 2 1 GO!"
The hand job is frantic. Right now I do not look mine but I look at the dozen my teammate’s cocks. The average length is high in this locker room. We are young but some have a very big one. Because of my curved dick I almost jack off everything alongside but I did not ejaculate last. Yuck, there's lots of sperm, I'm glad I not have to eat the biscuit. Then I dress and I leave the gym.