If you played game on your own rather then downloading random savegame, you would be able to choose will you let uncle stay or will you make him leave. There are 2 female protagonists. and there is Drake, Cain, and Steven as well. But to unlock them, yes I guess you would need to do some effort and play the game. If you look inside sweet memories maybe yo uwill find these scenes.
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Also here is scene that you missed:
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So just remember when you call someone a liar make sure you have evidence about that and not just making things up just cause you played game that is even TAGGED with NTR and you are obviously not into NTR. No need to be ragy about porn game. Cain will cover all rage in the game once you take control over him