Thank you! I happen to like that the sister isn't the same virgin arch-type that plagues these stories. Hell half the time I play a game with a "slutty" LI it turns out that she's not really slutty, she just acts that way but really she's a wide-eyed virgin just waiting for MC's cock to put her on the right path.
It was refreshing to see someone like sex and want to have it. Sex is great! People should enjoy it. I also shouldn't have to say this, but it seems to need repeating: Women like sex too!
I'm not saying virgin stories don't have their place (and aren't fun), but it gets tiresome when devs have to twist the realities of their stories into knots to ensure that every LI the MC meets is a virgin just because a section of the fan base demands some sort of weird purity.
Finally, if you are afraid that a character in a game might not be to your liking...then play a different game. It's one of the awesome things about this website. There are a ton of games and they cover almost every different kink and setup. Some of the most popular games here I don't like at all, and that's okay! Like what you want, but don't get upset if a dev has a vision for a story that you don't like.