I hadn't even heard of slash before when a random click on someone's LJ brought me to a listing of the user's favourite stories / pairings for different fandoms. The idea of Snape/Harry intrigued me, and Quid Pro Quo was on the top of her list. So I read it.
I couldn't stop! I was late for an appointment (and skinned my knee tripping on a corner of carpet), and as soon as I got home again, I went back to the laptop. When I was done, I quickly read my way through the rest of Aucta's stories, and moved on to dementordelta.