I'll bite! For short, sex stories, I prefer 3rd person. It feels easier and quicker to understand the motivations and thoughts of the characters if a 3rd person narrator explains it to the reader which allows me to focus more on the sexy bits.

If this was a novel, then 1st person protagonist is my favorite POV. Having the protag slowly figure out the antagonist's (tragic) back story and potentially identifying with them is great.