Library Fun

We go to the library once every couple of weeks. The girls like to pick out their own books so they go over to the kids section and pick out 2 or 3 books each and then we check them out and go. I usually don't look at the books they pick out until we get home so it's not uncommon to have Christmas themed books and things. Yesterday we went to the library and it wasn't until later that I saw what book Megan picked out.

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How do I explain to the girls why mommy won't read it to them? :)