Innocence Facilitating Perversion?

[svejkist]

I am envisioning a brother-sister incest/virginity story with peripheral voyeurism. The story should be first person as the sister's reminiscence, with dialogue. Both are virgins. Her bedroom is adjacent to their parents' room. She hears them having sex and it starts to arouse her. She shares the experience with her brother and they discuss the implications. Both are aroused and there are hints of attraction. They resolve to spy on their parents in order to figure out how the sex thing works. Via keyhole, or some other flawed vantage point, they see their parents have in sex doggy style. Later the sister is in her room listening to their parents. The stirrings she had felt are stronger now. She gets her brother. Since both are now aroused, and have some idea where this leads, they resolve to try having sex themselves, from behind, the only way they know how. Through inexperience and innocence they accidentally have anal sex, not realizing the difference. I'm not sure how to best work in realistic lubrication, but there are possibilities. This anal sex becomes a regular activity, eventually flowering into a more complete sexual relationship. That means emotionally as well. In the beginning anyway it should just be innocent experimentation that in their minds is not focused on their familial relationship. Over a series of course that couldn't last.

If anyone wants to tackle this, obviously ignoring or embellishing any aspect of this treatment, I would be very interested. I have always liked stories about people's first time being exclusively anal. A woman I knew in college wrote one that was unbelievably hot. Roll that up with some incest and you have a mega-taboo. Thanks in advance.