how about a story of a male and female roommates who decide to just to masturbate together. They start off shyly walking in on each other. They discuss it and learn what turns the other on. They accept each other more and more. They play masturbation games with dares and challenges. They play all day edging their orgasm and teasing each other. There can be anal play involved, toys, cum eating, sharing each others cum (female ejaculation). But no touching. This happens for months or even a couple of years, until that fateful day.