Soooo the character jacks off to a girl he likes and when he learns that she only likes him platonically, he freaks her out by telling her that he wants to have sex with her? Wow, that's totally not viewing her as a sex object at all! This is completely disrespectful to a woman. :/ And I'm guessing that this is something you actually did. That's not how you treat a girl. . . . at all.
I can argue that you are a pervert since you were jacking off to someone who sees you as a brother, but I'm not going to get into that. However I will tell you that A) you don't confess a crush to someone by telling them that you get off to them a lot and want to have sex with them. That is . . . beyond creepy dude. B) If a girl likes you platonically, you especially don't tell her that because it will, I assure you, creep her out badly; even make her not want to talk to you for a while. And C) even if a girl does return your feelings, that's just not something appropriate to tell her right off the bat?? "Hey since I just learned you have a crush on me, wanna have sex?" No. Just no. That is not socially acceptable. It's very rude and perverted.
If a woman turns you on then, okay I guess. I mean it's not something that can be helped. But man, you handled that so completely wrong and disrespected her in the process. It honestly seemed like you were more interested in her for her body rather than her personality. In which case, that would be lust, not love.
Regardless if this actually happened to you or not, the game still conveys the idea to disrespect women, and that's not what I stand for.