One day Harry meets Anthea, maybe while visiting John (maybe she's even drunk when it happens, so it's not a pleasant situation) and falls hard for her. She even quits drinking and puts herself together, because there's no way a beauty like Anthea would like to be near a drunkard, right? She starts courting, and somehow tries to seduce, Anthea (Watsons know how to do those things ;-)). And maybe she succeeds.