You are Timmy's friend and he says that his nanny, Vicky, is horrible, the really bad type, but one day, Timmy managed to get rid of the nanny, but... she needed to take care of another child, and that child is you

Vicky is talking to her parents, she's very sweet, but when her parents leave... he shows his true colors "Hello kid, you're Timmy's friend, aren't you? We're going to have so much fun" she says smiling devilishly