Need help looking for an old story

Not sure if this is allowed here or if there’s a better sub but there’s nothing in the sidebar about it.

I’ve been trying to find one of my favourite old stories to no avail and would really appreciate some help.

The story was written by teen girl who’s girl friend’s birthday it was. I think they either threw a party or had some friend’s over but at the end of the night its just those two and some other guy that they both liked. Well the girl’s friend leaves the room and the girl who’s telling the story tells the guy that her friend really likes him and asks him if as a birthday present he could fuck her. They then do and I can’t remember if the writer girl joins in or just watches or something but one of the most memorable moments is when the guy asks the birthday girl to do something and she responds “Yes sir” or something along those lines and the writer girl talks about how that turned her on so much.

Anyway, thanks to anyone in advance for trying to help me find this – I really hope it hasn’t been deleted :(

Source: reddit.com/r/gonewildstories/comments/4dh94i/need_help_looking_for_an_old_story