The Houseguest by Kimberly Kemp

'She was like a magnet, a temptation as strong as the strange hungers she had so deliberately awakened'

'It seemed impossible that anyone so young, so pretty, so radiantly appealing could be so utterly corrupt. It seemed impossible that a mature woman could be so vulnerable to the dark rapture offered by a girl still in her teens. It seemed impossible that a widow and a mother would ever sink so low as to compete with her own daughter for the attentions of her daughter's best friend. It seemed impossible that a few whispered words could render an intelligent female so powerless that she'd beg for the privilege of being degraded and debased.'