I'm trying to find a story in which a girl babysits twins or siblings and they are just the little devils and the person who she meets via caring for the kids is the spitting personality (not necessarily image) of the kids in which she is caring for, and he just acts pretty much the same as them and she questions who learnt what behaviors from who, something like that? Possibly she falls in love with him.
I'm not after searching for a story I once read, this is one I conjured up and just wondering if there is a similar story line to what I am looking for.