This book plot is driving me insane!

It's about this guy in love with his best friend's little girl and he's waiting for her to come out age. She gets drugged on her 18th by this classmate and the hero saves her and scares the shit out of the rapey kid. He takes her home and sort of touchs her while she's still asleep but waits until she wakes up to take her virginity
He makes her call him daddy and they grab breakfast near the end as his housekeeper leaves, and prepare to face the girls biological dad/his best friend.

Pure smut, one of the best books I've ever read and I can't find it -.- please help!