Justin stopped her before she left to get dressed, "hey, do you want to do stuff with our clothes... off." He wasn't even sure there was sex in this world, but it was worth a try.
Melissa smiled and turned to him. "Shut the door behind us, we don't want my entire apartment seeing us." Looking at her undeveloped body was weird, she was still his naked girlfriend, but she was so undeveloped and childlike.
At least people still had sex of some sort. He started removing his pants, but was still a bit weirded out by seeing his flaccid tiny dick. Even if they would do something it wouldn't require him to be hard.
She embraced him. He felt so skinny and hairless as did she. She was so light as he held her, feeling her flat boyish chest. Her hands moved to his childlike penis and started to play with it, it felt weird to have it squished around and rubbed like that all without it getting hard. Her rubbing did feel good though. Eventually he started playing with her vagina, it was so small and childlike he didn't really know what he was doing, he kept rubbing it though it stayed completely dry.
After a long time of constant rubbing Justin felt an orgasm hit him. It felt amazing though there was no jizz. Just this intense feeling of pleasure, and after it ended another wave of pleasure hit him. He was having multiple intense orgasms. Was this what girls felt when they orgasmed?
Eventually his orgasms stopped and it was just about pleasuring her, it was weird just looking at her small hips, it was such a different looking version of her. He started licker her vagina. It wasn't like licking an unneutered pussy, there was no physical arousal, it was so small and delicate, without the sensitivity of a normal vagina. But eventually she started to moan with pleasure and the deed was done.
After it was over he looked at her. That small hairless body was so childlike and adorable. Mabye less sexy but very cute. He could be satisfied living like this.