Obviously, Jon had never been a girl before, and decided she wanted a better look at herself before changing back. She quickly ran up to the bathroom and locked the door. She was still wearing the same clothes she had on before the transformation, and her boxers still felt strangely empty, and a little damp.
Checking a second time to make sure the door was locked; she stripped off her clothes, and started to look at her naked body in the mirror, and was still a bit surprised to see a girl version of himself looking back. She noticed her longer hair looked messy, and decided to comb it a little. Next, she jiggled her breasts, and her reflection did the same. They were real! She had actual boobs on her chest! Their size wasn't bad either
She was already pretty confident that her vagina was real, which she confirmed with a single, anxious "crotch grab". She played around with her labia a bit, parting it with a finger and thumb, but as much as she wanted to keep exploring, she didn't want to hog the bathroom, so she got dressed again and left. She had to admit, she was taking this a lot better than she would have expected, but then again, she'd always felt a bit detached from everything, and unlike everyone else who transformed, she knew a way to change back.
Jon went back downstairs, to where her younger sister Zoe was watching some horror movie, and sat next to her on the couch. When the commercials came on, Jon said, "You know, maybe being a girl won't be that bad "
"Really? How's that?" Zoe asked.
Jon grinned, "Well for one thing now that I'm a girl I can play with your boobies!" she said suddenly, jiggling her sister's breasts.
Zoe squealed, raising her hands to protect herself, and trying to wiggle away. "Jon, stop it! That's so gay!" she laughed, slapping her playfully. She grabbed her new sister's arm, and jiggled her breasts in retaliation with the other hand. Jon gasped as he felt the strange sensations from his breasts again and started giggling.
Zoe couldn't help laughing too, and soon they were cuddling and laughing by the time the movie came back on. Jon hadn't felt this close with her sister in years; she'd have to stay like this, at least for a while until she got tired of it.