Ann has wanted to be more like Vanessa, she and MC are in relationship, and MC is actively working to "corrupt" her by having her tease and fuck other guys. There's nothing in this situation that has any similarity to MC/Emily, other than both these pairings are in the same game.Is it normal for siblings to be naked/lying next to each other? This is "Adult Play". Seeing as Ann quickly ascended from the "pure" path to the "whore" path. I don't think it's a problem to wait for Emily's sex scene either.
The fact this isn't normal for the siblings is part of the reason these plots take longer than basic hookups.
People who are comfortable being naked around each other don't necessarily want to fuck with other people watching them. Go visit a nudist beach one day, you will be shocked to find that a place full of naked people isn't a permanent orgy.Also is it normal for Emily and Joe to be naked next to each other and just watch TV? If a naked woman was next to me, I would fuck her instead of "watching TV". That's the logic