I feel like Marcus should fuck the aunt first before Tracy. Storyline wise Even though the mc agrees to help Marcus and Marcus does tease her and everything to give her the idea of fucking him she doesn’t do it cause it “wrong”. So I feel the mc is gonna go to the aunts house so he can get his fix about his mom being used since she isn’t willing to fuck Marcus yet. The aunt is gonna talk to him again about how much Tracy was a slut when she was younger and cause that turns him on so much the idea of Tracy getting fucked he will accidentally say something about how he wants to see Marcus do something like that. The aunt would be suprise ask him what he’s talking about and he will tell her. Then next time they meet she’s not gonna tell him story about Tracy instead she’s gonna invite Marcus and fuck him and rp as Tracy for the mc and after that all happen she will help him to make sure Marcus fuck Tracy by telling him something that always turns her on and makes her a slut without fail in and in return Marcus has to fuck her once in a while besides Tracy then this would lead down to a threesome of the sister or a foursome with the entire family