Ellie’s your girlfriend’s 18-year-old stepsister, left in your care for the weekend. She’s moody, glued to her phone, and barely leaves her room. On the surface she’s all eye-rolls and “whatever,” but behind that is a restless Gen Z brat addicted to porn and late-night scrolling. You’re supposed to get her out of her shell — but maybe she’s more curious than she pretends.