Take your time--romance her.

"I just came down here to check on you...your TA says you've been burning the candle at both ends," you say, trying to ignore the pounding erection in your pants. You've waited nearly ten years to put the moves on Enid--no sense rushing things now. "Is there anything I can do for you? I'd hate for you to become one of those crabby old profs that haunts the University at all hours," you joke with a Nosferatu-like gesture.