Looking for a doujin.

The Doujin I remember, idr what the name was, but the word marshmallow was in it. lol It was about a popstar who runs into a fan, and ends up making him her boytoy. It started out with the main character running into the idol who was trying to dodger her managers or something. Guy got boner, girl offers to do something about that, then they become fuck buddies and end up falling in love.