The class at the pool went on without a hitch, Rebecca's idea of shorts worked and no one noticed their dicks.
After class she changed without any problems, but when she was leaving the locker room she was stopped by Mark, a boy in her class, who wanted to talk to her in private. They then stayed behind the others and he asked Jen to go on a date with him.
Jen had some interest in him so she accepted, believing that it would be okay if they just left together.
On Saturday they spent the whole afternoon together and went to a nightclub later.
After they left the club, they passed the square on the way back. As they had had such a good time together, Jen had completely forgotten about her cock. Mark then advanced on Jen and stole a kiss from her.
After the kiss, Mark said "We are so good together Jen, would you like to spend the rest of the night with me in a motel?"She accepted and they went to the nearest motel.
As soon as they entered the room where they were going to stay, Mark hugged Jen for walking around keeping her close so that she could feel he had a hard-on, so he said "Are you ready to have a lot of pleasure?"
Jen liked the idea and started to get excited too, but she remembered her dick when she felt her dick get hard too. She broke away from Mark saying "I'm sorry, but I don't think it will be possible."
"Why not? I thought you were interested in that." Mark said
"I do want to, but it won't work." Jen said
"If we both want it then it will work." Mark said and hugged Jen again, this time from the front. When he did that he could feel Jen's hard cock through her clothes and said "Hold on, do you have a cock? You are a man and you have fooled everyone so far."
"That's not it. I'm a whole girl, but for some reason a stick grew in me earlier today, but I still have my female parts." Jen said
"I won't believe this if I can't see it." Mark said
Jen then reluctantly took off her skirt, undid her panties and lay on the bed, lifting her balls and showed Mark her pussy. "As you see I am still totally a girl. If you're still up for it, we can still have sex. Don't worry, I have no intention of using my dick on you." she said
"Now that I'm sure you're a girl, we can go on with what we were going to do. All I need to do is ignore your dick." Mark said and then immediately undressed while Jen removed the rest of hers.
Jen then turned her back to Mark and lifted her ass in his direction, so that he could enjoy the moment without remembering her dick. Mark did not hold back and put his hard cock inside her pussy.
The couple tried to take advantage of the moment doing everything possible to forget about Jen's cock, but it was not possible because they could feel their balls hitting each other with each thrust of Mark. There was also her hard cock, which hit her belly producing a sound that was hard to ignore.
In a short time Mark came. Jen also came, not the female orgasm but the male one too, shooting her cum.
When the orgasms were over Mark and Jen lay side by side on the bed, both still with a hard-on. Jen compared and saw that Mark's dick was 4 inches long, but it didn't last long because his dick started to shrink.
Mark jumped with the scare and the two could do nothing but watch his dick get smaller and smaller, his testicles being pulled in leaving his bag empty before leaving just smooth skin in place. When his cock had just disappeared, the smooth skin that had formed opened to reveal his newly formed vagina.
Jen was just as surprised as Mark, who looked at her in time to see her dick get much bigger, leaving her with 8 inches of manhood between her legs, just as her balls also grew.
With that Jen got desperate, put on her clothes anyway (she didn't put on her underwear) and ran out, going straight to her house.
Arriving at the door of her house, Jen realized that she had run all the way with her hard cock loose, lifting the front of her skirt, but she knew that no one had noticed since that time there was no one on the way. She went into the house and went straight to her room, but was interrupted when the lights suddenly came on.
"Standing there, young lady. It is over and much of the time you said you would be home, I was already dying of worry." said Jen's mom who was already waiting for her
Jen ....