Going inside the house Jon said hi to Karyn's mom and made his way up to Karyn's bedroom. Putting his heavy schoolbag down beside the desk he turned to the bedroom mirror and was once again amazed to see Karyn's reflection instead of his own. He felt like he was in an episode of Quantum Leap. When he looked down at himself he saw himself as he always did. The clothes he was wearing were ridiculous but they fit him perfectly. The bra he was wearing clung tightly to his chest and created what looked like two small, soft breasts under his white top. The jeans he was wearing looked tighter than any jeans he had ever worn before but again they fit him perfectly. There was even a small bit of room in them for his penis but far less than he was used to.
Deciding to change into something more comfortable Jon took off the top and jeans and stood in a white bra and matching panties. He felt embarrassed as he looked down at his hairy chest and legs and saw his penis enclosed tightly in the panties. He absently scratched his penis through the panties and had to admit that they felt very nice against his skin. Looking up at the mirror he felt kind of perverted to be staring at Karyn in her underwear but he reminded himself that she had caused this with her wish so he felt emboldened. With his eyes locked on Karyn's reflection he reached up and rubbed his flat chest through the soft bra cups and felt a thrill of excitement watching Karyn rubbing her breast through her bra. He instantly felt an erection growing in the panties he was wearing but the reflection of Karyn's crotch in the panties didn't change at all. Smiling to himself he continued with his exploration and rubbed his free hand around his penis before putting it inside the panties. It felt incredible to Jon. It was like some kind of interactive virtual reality experience where he could masturbate and watch a girl who he, admittedly, had always been attracted to do the same to herself.
Before he could take things any further Jon heard Karyn's mom calling up the stairs that dinner would be ready in an hour. Wanting to try to get his homework out of the way before dinner Jon decided to get dressed again and get on with it. Choosing comfort over style Jon went to Karyn's wardrobe and found a pair of sweatpants and a small t-shirt. He put the t-shirt on first and watched in the mirror as it stretched tightly over Karyn's breasts and caused them to bounce around a bit. Stepping into the sweatpants he turned his back to the mirror but before pulling them up he looked over his shoulder first and stuck his butt out at the mirror. He soaked up the view of Karyn's round butt encased in her silky panties and he suddenly remembered seeing one of the girls in school in a similar position as she bent down with her back to him after gym class. At the time he had paid it zero attention but right now the memory of it caused his already erect penis to twitch inside the tight panties it was nestled in. Jon pulled up the sweatpants, enjoying the similar effect they had on the reflection of Karyn's butt. Her butt jiggled a bit as he pulled the tight pants up and over his hips. These sweatpants were much tighter than the ones he was used to wearing and they showed off every curve of Karyn's hips and butts. While they were somehow a good fit for him they didn't offer as much space in the front and it felt like Jon's penis was going to burst out of the front of them. Looking down Jon could see the tent he had created in the front but turning around all the mirror showed was Karyn's smooth crotch in a pair of tight sweat pants.
Trying to take his mind off the erotic scene unfolded before him Jon decided to focus on getting his homework done. He sat down at Karyn's desk and opened up his school bag.