What happens when little sisters just can't help themselves.?

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Steph woke up in the dark. As far as she could tell, it was still full night out. She wasn't sure what had roused her.

Her best friend, Blake, was snoring softly beside her, still fast asleep by all indications. It had gotten late while Steph was over, and it had been easier just to crash than go all the way home. It wasn't any big deal.

But now the door was creaking open. Steph frowned and lay still. That wasn't normal. No one else slept in the room. Not that she'd ever known. Blake's parents, older brother, and younger...