There is "Never Enough: A Novel" by Miasha at http://www.amazon.com/gp/product/141655338X/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER
It's part of a series and has a pretty high rating. I've been planning on getting one of the books in the series myself. It does warn in the description that it has some x-rated parts. There were a couple of others but I can't find them right now.
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Super Squirrel