Monstrous Lust: Transformed by Lust by E.M. Beastly

Kayla saw him outside her window. He was a magnificent, gorgeous creature, but also a dangerous predator. He had been hunting her for some time. Then one night she went looking for him and let him capture her. It was a gamble; she was betting that his desires were the same as her own. The encounter paid her with a curse. Now she, under the light of a full moon has become the monster, and she is in heat. After all, Beauty is the Beast.