You are the ghost of Sammy Grainsville who died at the hands of mysterious circumstances twenty years ago and haunted the home since then, until Natasha tried to banish you ten years ago and stripped away most of your power to leave you dormant. No one else bought it during that time and you remained powerless until a new family has moved in, consisting of Hans the Husband, Marin the Wife and Elizabeth the Daughter.
That night, after moving everything in, Elizabeth decides to play with herself and her lust called to you along with the sexual frustration of Marin, awakening your from your dormant slumber. Now you need to regain your power to interact with the living world and sate the lust that haunts you even now.