Steve hadn't even known Dustin had a sister.

Yet there she is, a stranger sitting on the couch in the Henderson house that he's grown so comfortable in. She has to be a relative. That or Steve needs to call the police. A constant stream of what the fucks go through his brain as he stands there dumbly. Steve blinks a few times as if she'll disappear but he's not hallucinating. "Hello?" He asks, because he really can't think of anything smarter to say.

Now that he thinks about it, the sudden appearance of this chick aligns pretty perfectly with the break time associated with college. Maybe that's where she's been? While he's been busy taking her younger brother under his wing? Yeah, maybe not. "Who're you?" He asks again, a little incredulously.