Word of advice:
She lives across the hall, so if sex comes into play then whatever man do what you gotta do.
Just remember that consent is sexy, and that since you practically live together you really need make sure that if things kick off she's not that overly obsessive type. And not a fake moaner.
This is what my roommate is going through right now. A really loud faking, overly obsessive and attached girl across the hall. Though, he kinda asked for it with the way he talks about women anyways.