The story is from the viewpoint of a guy who has a crush on a girl at his school. He doesn’t know much about the girl’s private life because she’s kinda secretive. Luckily, they get paired up to do a project. The girl then suggests that he should come over to her house.
The guy then comes to know that they’re a nudist family. The girl’s father is named ‘Art’, and she also has a sister. Art tells him that the women of the house would serve him when needed. As time passes, they work on their project. The girl’s sister also keeps giving the protagonist frequent blowjobs.
One day Art gets a call and tells that he’s gonna be away for a while and the protagonist will have to look after the girls for him. The crush tells him that Art goes away for work every once in a while. Art also tells him to get his wife pregnant, and the protagonist does so.
In the end, they get a good grade on their project and end up going to prom together. They also have sex towards the end.
Source: reddit.com/r/eroticliterature/comments/8icats/need_help_finding_a_story
Think I read a similar story in the Kirsten Archives, have you looked there?
I really hope you find it, this sounds great!