Her lunchtime sexcapades started with just Ron, Harry and Neville, then eventually grew to Seamus and Dean as well. As Headmaster Dumbledore kept adding more and more tasks for her to qualify for extra credit – "Miss Granger, you can’t expect me to give you extra credit in all of your classes if you aren’t putting in extra effort" – she couldn’t afford to waste any hours of the day. That’s what led to her moving into the Gryffindor boys’ dorm, and letting a few of the lads in her year know she’d be at the Room of Requirement at lunch doing special tutoring.