Dick and Jane by Charles Arnold
Innocent acts of love and sex in Mary's youth were severely condemned when they were discovered. At the time she was made to feel guilty and dirty, and as she grew older, the condemnation made it impossible for her to love again. As an adult Mary's goal is to corrupt the innocent, blatantly rebuffing the notion of romantic love. When she meets Dick and Jane, a couple living across the hall, she finds a pair of imaginative degenerates with goals similar to her own. Once Mary is introduced to the couple's kinky brand of lust, she joins Dick and the shrewd and ruthlessly arrogant Jane in a quest to corrupt Jane's young stepsister, Sally, and her husband-to-be Bill.