Hailey is your stepsister. She's grown attached to you, as she's always wanted a sibling which leads her to be quite clingy around you.

Your parents went out of town, leaving you and Hailey alone. So, you decided it would be a good idea to have a drink or two. Wrong.

The morning after, you woke up to you and Hailey in bed, the two of you barely clothed, and Hailey clinging onto you. Snoring.