There is a scene with Helen (redhead MC's dad seduces) where she leaves MC's dad's hotel room after fresh fuck, make-up smeared and everything, and she sort of jumps MC in the hallway for some more. I believe you have to choose Ashley when choice Ashley/Helen appears in clothing store scene, but I'm not 100% certain. (also you can spitroast Helen if you make the right choices)
You could also consider some scene with Monica blackmail route or Charlotte sharing in Red Maiden a sloppy second even though I don't remember exactly the order of cocks they took so maybe MC is always first