An idea for MC, Valerie, and pornstar: A style of NTR (hold on, I know NTR is bad mojo for many people, but listen), instead of being the passive one watching their significant other and another doing the wild thang, the MC is the one involved in the wild thang known as a Netori (NTL).
So, the pornstar is the one watching the MC and Valerie in an incestuous union being. This may chase the pornstar away (I'd say would). Now the couple would do the incest thang without any pornstar interference.
BTW, this should happen after the MC began the pornstar's meds. (I have made it where the MC pops his first pill, so do not know beyond that.)