[ Because there is no way she wants to hear this answer. His eyes are wide and he looks at her very scared for a long moment, and then, hesitantly... ]

'Cus I knew I was going to fall for you since you were like... nine? [ It might have been younger, it might not have, he'll go with nine because that just seems reasonable. ] And I've been waiting for it. Err. You? To be old enough for it.

[ The wording is strange there, and he knows. But the fact of the matter is that when she was young, he was already drawn to her, already was finding himself fixated on her, and when he caught the whiff of some prepubescent beginnings of a scent, he ended up zeroed in on it in a way that made him feel wrong. So. He waited. ]