After sex, he tells you that you have been once his little brother, and that a genie of a bottle granted him three wishes. One was to turn you into a girl, the second one, to make you unrelated and erease your memories.
You look at him in disbelief.
He proceeds to ask for a blowjob, but you decline.
Then he suggests to spend the last wish on restoring your memories, and if he is right, you blow him.