Does she cheat when the MC isn't watching, and can the MC ever tell her about his cheating, or get caught? One more, if you encourage her, how is the couple dynamics, is it just the MC watching from the back seat, does she tease him after/during the scenes, do they keep have sex or does it spiral down into a full cuckold situation?
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He appears to be egging her on and she seems to be slowly warming to the idea. There's no teasing or humiliation, but cheating if you choose. This is pretty basic stuff. I suspect you're hoping for subtle nuances that just aren't there.