Looking for a story

Hey all

Im looking for a story. A woman invites her "friend" over, her boyfriend cheated on her with said friend and she wants revenge. She gives h r friend a protein shake and says something foreshadowing about people who think they can use their big breasts and asses to get whatever they want. The friend realizes what she's referring to and attempts to leave but begins to gain weight. She is fed more shakes and countinues to grow. At the end the woman feeding her leaves, saying something along the lines of "try to be a good little  piggy and explode by the time the cleaners get here tomorrow or its another shake for you."

I read this several years ago and have been unable to find it since. I don't believe it was on this site.

Thanks all