13 Darkest Promise - Gena Showalter - 4 stars

Cameo is possessed by the demon Misery and isn't allowed to feel joy.  If she does, her memory is wiped.  Lazarus the cruel and unusual rules his kingdom to annihilate his enemies until he meets Cameo.  He's relentless in his efforts to make her smile and seduce her into his bed.  If Cameo falls for him, she'll lose her memory of him.

Cameo and Lazarus' interactions are amazing.  She refuses him all the time because she can't handle his attitude.  Lazarus can't stay away from her because he needs her so much.

The two were so busy trying to save each other they kept trying to separate.  While initially this wasn't annoying, it became very frustrating towards the end.