Mrs. Weasley is my personal concubine

With Mrs Weasley by your side, you can either corrupt the family completely(with her help of course) or you can pursue in some other direction. Both seem extremely viable and you instruct Mrs Weasley that around other Weasleys she must not refer you as Master Harry (for which she seemed disappointed, huh, this is how Voldemort felt around Bellatrix).