Monster Lover from the Lake

Trapped in a loveless and unsatisfying marriage, Lily dreams of more. She craves danger, excitement, and most of all, a man who will do more in bed than mount her like a goal in heat. She's heard from the loose women in town what a good time with a man is meant to feel like, and now that she's shackled to a wealthy man like a trophy, she feels she'll never know for herself. But her prayers are answered when she escapes to the lake one night, and a man (or monster?) emerges from the dark water.
He is not human, that much is sure. But he is well-endowed, and unlike Lily's husband, he is WELL up to the challenge of giving her all the pleasure she could ever want or dream.