1. I know that she's over 18, but does she act, and think like an adult?
2. Are there any happy sex scenes where she's with someone that's meant to be attractive, that she's attracted to?

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1. Yes, very much so. She actually acts more composed than what many peeps expect.
2. In the handsome bastard route, with certain choices, she can be seduced with relatively little blackmail in play. I think they get off to a rocky start, but she warms up to him quick (of course, involves ignoring her as the MC).