"Hey Sam! It's me, John. I just was wondering what kept you in the locker for such a long time"
With these words John opened the door an entered the small room.
"Why are you hiding yourself in here behind a towel?" John asked. "It's just us buddies in here!"
Sam thought of what to do and thn decided to let John know what happened. He dropped the towel and tried to explain:
"When I wanted to change I found zhat I toook my sister's bikini instead of may trunks. First I only wanted tu use the bottom but then I was intrigued to put on the top as well. This aroused me and I started to masturbate. Luckily you interruipted me as my breasts started growing while I was stroking my cock. Now you see me here as a man with small breasts."
"This sounds very strange", John replied. "Maybe you should remove the bikini top and things might come back to normal."
"Good idea", said Sam and opened the top. He let in fall to the floor an exposed his new built breasts to his friend.
"It didn't work" both at the same moment.
"How do they feel?" John asked. "May I touch thgem?"
He reached to Sam's tits and pinched one nipple. Sam felt a strange tingling coming from the breasts and made a step back.
"Leave this!" he shouted. "I don't like what I am feeling. Have you any idea how I can get rid of theses babies?"
"As you told, it happened when you put on the bikini. So perhaps can be reversed when you dress in a man's swimwear."
"This sounds logical. So give me your trunks and we can try."
"Er, better not", John answered. "This might leave m naked in here and I don't know what might happen then. But there is a shop fpr bathing items at the entrance. I go and get you something from there."
John left the locker leaving Sam to explore his new assets.