I read a short story on /r/Writingprompts sometime in July about a guy who brought home a girl and slept with her and woke up to find her still there in the morning. The title was something like "you brought a girl home last night and slept with her but in the morning she was still there and she asks you to do something that you never would have thought anyone else to ask" or something along those lines. He thought she would leave once he got back home from work but she was sitting on the couch asking him for more and he thought if he slept with her a few more times she would leave so they eneded up doing it all around the house. Towards the end of this story the man does something that she apparently asked him to do in bed which was to pour hot candle wax on her and he ended up burning her really bad even though she seemed unphased and asked him to do it some more. The man was freaked out and went to a hotel until he heard the woman's voice in his head asking him to come back and "burn her" even more. So he goes back to his home to do this and finds her on his couch once again with a "familiar smell of rotten pineapples" or something along those terms and the reader (You) finds out that she has been dead the whole time because the man choked her too hard the first time they slept together and she died. So he pours gasoline on her body and burns her and while she is burning the woman (who at this point is just a voice in the crazy guys head) asks him to do one last thing for her and she says "burn with me" which commenters of the thread discussed that it was his guilt that was talking and were also praising the OP for making such a twist in the story. Those are all the details I can remember form that thread.