I know. The point is that boarding school is not some magically shielded haven where erections and what causes then remain a complete mystery to 18 year old girls. I can totally see her being a shy, insecure virgin. That's fine. I can see her being naive and perhaps easy to manipulate. Fine.I wasn't talking about any girls you may of met in real life, the assumption I was talking about was relating the real-life girl(s) behaviour to that of D.
But when you're 18 years old, playing naked kissing games with a dude who's been groping you every time you're alone for a moment, there's something very wrong with you if you're not clear on why he's hard.
And no, "but he's your dad" doesn't cut it as a reason. You know damn well you have an unorthodox relationship with all the things you're doing, and your insistence on hiding it from everyone.