In the fic Justin makes an offer to Brian about having just a sexual relationship on Brian's terms.
What I remember, Justin approaches Brian at his jeep and says something like, he's glad he has a body that Brian likes. He blows Brian behind the jeep. Brian does take Justin up on the offer and calls whenever he wants Justin. They start out having just sex, not conversation, I also remember Justin and Brian being "caught" by Michael and Ben. They kept the arrangement from others. I think Justin told Brian he should have told M/B he was basically his "maid". I know it's not much but, I am hoping. I think the author was Myrna or something like that