I don't know what site it was on, but I read a story where a twelve-year-old regresses himself and his big, jock brother with an aphrodisiac lotion, and the jock forgets how to fap so the brother helps him. The jock kept calling the little brother a pervert earlier, but now he likes it. One of their names started with K (Keith, maybe?).
It was in a Notepad format, just text. I found it on Google a month or two ago, but now I can't find it anymore. I'd be really happy if anyone knows this story.