A character starts out trying to help one character hook up with another, but ends up in love with the person they were helping (or worse, the person they're trying to help them get), seriously undermining their own efforts. Why? Perhaps they felt unworthy and just wanted their beloved to be happy, but in the end just can't resist their own feelings. Or maybe their intentions were pure at the beginning, but the excessive attempts to help their target caused feelings to bloom. Wife Husbandry can be mitigiated if the older man heroically tries to pair the younger woman off with men her own age.