Jon suddenly found himself naked and then felt a warmth go through his body as he testicles pulled up into his groin to form his ovaries, His penis inverted and became his vagina and a pair of C cup size breasts appeared on his chest. He shook his head as if coming out of trance.
He looked over at Karyn, and smiled. "I do understand!" he said as picked up a jockstrap and slid it up his legs to his pussy.
Karyn replied, "I knew you would! My mom totally freaked when she caught me wearing nothing but a jockstrap, but I can't help it."
"I know, " Jon said, "I have to hide my jockstraps and boy's underwear from my mom. She would spazz if she ever saw me wearing them."
"Neither of them would ever understand how hot it feels to wears guy's underwear. It really gets me wet" Karyn observed.
Jon turned to show Karyn how hot his feminine ass looked framed by the straps of his jockstrap.
"What do you think," Jon asked.
With that she stripped down to her own jockstrap and pushed Jon down onto the bed.
"This is what I think" Karyn replied.
Soon they where in a 69 position licking at each other's pussies through the rough pouch of their jockstraps. Jon moaned in delight as Karyn nips at his vaginal lips through his jockstrap and he playfully ran a finger along Karyn's slit as her jockstrap moistened with her pussy juice.
There licking a nipping continued and then suddenly they climaxed as their hips bucked.
After laying in the afterglow, Jon said, "Let's get dressed and go to mall"
"Sounds like a plan" Karyn smiled. "Mom threw out all my tighty-whities, so I need to stock up. Can I borrow a pair of yours"
"No prob ... " Jon answered as he and Karyn began to get dressed.....
