Neglected by her husband Kevin for years, Lily develops a trauma-induced sex addiction — and begins dreaming of forbidden encounters with Arthur, her father-in-law. Desperate, she books a top specialist, only to find Arthur is her doctor. Under his intense treatment, she loses control, overwhelmed with shame. She tries to rekindle things with Kevin, but discovers he only loves her half-sister Chloe — she was just a cheap substitute. Devastated, her condition worsens. She returns to Arthur for treatment. During a session, Kevin bursts in; Lily hides under Arthur's desk and somehow completes the test. Later, she catches Kevin and Chloe plotting to commit her to a psych ward and steal her trust fund. Waking from her illusion, Lily turns to Arthur, determined to heal — and reclaim everything that's hers.
