You picked up the box again and searched for a condom. There was a condom with a brown packaging while a lable "Japanese Genes". You tore it and pulled the brown condom out.
"Chang! I'm going to pee. Get out!" Said the man banging at the door
You didn't mind him and you placed the condom on your hard cock and unrolled it.
You started to transform. You stood up and walked in front of the mirror. The man was still banging at the door. You looked at yourself and saw that you we're getting taller. Nothing changed much on your body expect on your height, weight, face and your dick. Your face lost all the pimple scars and it became smooth. Your hair changed into a bowl-cut. Your cheeks looked much thinner than usual. Your nose got longer that before, it's not that flat anymore. You stripped off the remaining clothes on you to see that your body fat are getting thinner and thinner every second until you are a bit lankier than before, but not too much. It seems just right. You looked at your hard dick as it fills out the big condom as your balls gets bigger. Hair sprouted around your dick and was now unshaved. Your skin got a little paler than before.
Suddenly the man stopped and everything around you changed. You aren't in the bathroom anymore but inside a japanese bedroom. You looked around as see that no one is in the room with you. You looked at yourself in the new mirror in front of you to see a young Japanese teen, probably 19. You fell down on the floor as you lose control to yourself and do nothing but to masturbate.
"A-A-Ah-Ah- Ahhhh- Ahh.." You moaned as your hand pump your new dick. "I-I'm gonna cum" You whispered in Japanese. Your hand stroked your cock faster and you release all your Chinese load and was being replaced by Japanese semen. You fell on your back as you are taking deep breaths.