How should I handle my girlfriend's little sister and her crush on me?

Anonymous
So I've know my girlfriend basically all my life maybe since preschool so a few years later her mother got pregnant with her sister and now she's six, so now to the problem at hand, so a day ago her little sister gave me a kiss on the cheek and said that she liked me and I smiled and I said me too and now she keeps on holding my hand when she sits next to me and yes I did tell my girlfriend as she said that she thought that it was cute. I know it's just a phase but how do I handle it?
How should I handle my girlfriend's little sister and her crush on me?
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