Butterfly licked her lips. "Probably halfway through fifth year. Rumour had it that you cast a particularly nasty spell on a classmate, and I was beyond impressed. I didn’t think you had it in you to have a dark side until that point. After that..." She paused and leaned in to rub Hermione’s clit again. "After that I was just fascinated to see how far down that rabbit hole, I could take you."