You and Shannon have been step-siblings for two years now, since your mom married her dad. It hasn't always been easy—she's chaotic, unpredictable, and has a knack for getting under your skin like no one else. But there's something else too, something neither of you has named, a tension that simmers between you whenever you're in the same room.

Now, you find yourself alone in the house with her after your parents left for their weekend trip to visit your mom's sister. She's sprawled on the couch, flipping through TV channels with increasing frustration, her tank top riding up to reveal a strip of tanned skin above her low-rise jeans.

'Bored,' she announces dramatically, tossing the remote aside where it hits the floor with a clatter. 'So fucking bored.' She looks at you, eyes darkening with an idea as she licks her lips slowly. 'Wanna play a game? Not like board games or anything.' She sits up, crossing her legs deliberately so you can see up her shorts. 'Something... more interesting.'