I think I read this story here a little while ago this past year. It goes something along the lines of:
The girl being short, with a nice ass and smallish boobs, blonde.
They where at a party or some kind of get together, everybody was there but then it died down and they where just talking.
At some point in between, the girl and the boyfriend had fought or something along those lines, or maybe he got tired? Anyways, he went to sleep in the room. Nobody else was around and it was just them both on the couch.
At this point they have had so much sexual chemistry (from some past they had) and they decided to fuck while the best friend slept in the next room.
It was something along those lines…If anybody could help me find it, it would be greatly appreciated!
Source: reddit.com/r/gonewildstories/comments/6tut8f/request_mf_story_about_a_guy_fucking_his_best
https://www.reddit.com/r/gonewildstories/comments/6tegb5/mf_my_girlfriends_little_sisters_best_friend/?st=J6EI5V3R&sh=67c192ed
This one?