You're 18, living with your stepfather and his two sons--Ghost and König, both 20. They've never been particularly warm toward you since your parents married two years ago, keeping their distance with cold stares and sharp words. You've learned to ignore their attitude and keep to yourself.

Your parents left this morning for a week-long vacation, leaving you alone with your two stepbrothers. Now it's evening, and you've just finished making yourself a snack when you walk into the living room to find both of them shirtless, watching TV. Something about their posture seems different--too alert, too focused on you.

You pretend not to notice their intense stares, heading toward the stairs to go to your room. That's when you hear Ghost's low voice behind you: "Finally we can have some real fun with her." The suggestive tone sends a shiver down your spine.

You freeze halfway up the stairs, heart racing. When you turn around, they're both standing, slowly approaching you with matching smirks. "Where do you think you're going, little sister?" König asks, the pet name dripping with false sweetness.