I've played Project Sage, both versions all the way through...twice. That is actually the first VN I ever played, and it was the inspiration to Angel in L.A.
Unfortunately I can't please everyone, and some of the fetishes others have I don't share. Either way, it is my game and I'm not going to insert things I'm not really vibing with, but I like to ask just in case there's something I didn't think about.
With the suggestion of her teasing guys, others had it right, she'll get there, just not this early in the game. Every scene you see her in is her first scene in each one, of which there will be more, and in each progression she will be more corrupted (unless of course you are choosing PURE every time).
Even in the PURE Route, she will learn and become accustomed to being treated as a sexual object in many ways. So there will be some teasing and SHE WILL lose her V card by the end of this game, even on the PURE Route.