I think you've already established the way it could work. Have one day end with, for example, Ashley on her way over for some sex, then start the next day with her texting the MC, something like-
Dom path- "Fuck, MC, no wonder Laura does whatever you say. I can barely walk!

"
Balanced path- "Damn, MC. No wonder you feel safe sharing Laura. That was a hell of a night!"
Sub path- "You did good last night, cucky! I think I had almost as nice a time as Laura had with Nathan!"
And then have her or the MC, as appropriate to the route, share some pics with Laura.