Plural Stories

Tons of dubious consent (including drugging, kidnapping), past emotional abuse (thankfully not dwelled on), one headmate ends up dating his therapist, and another headmate ends up bringing a high school boy home for banging. Also, the other multiple in the book was incestuously abused, which is depicted as titillating, and his headmate disappears due to the power of love. Whether you see this as a low-abuse or high-abuse book depends on how you prefer to read the dubcon scenes.