'Uuuugh Jesus Christ' is probably not the thought anyone should have about someone who is an ostensible friend approaching, but Severus is a special case. It's not that he dislikes Penelope, or wouldn't want to see her, but it's just how he reacts when his brooding silence is interrupted. He permits her invasion with a critical eye, but doesn't comment on it or attempt to shoo her away. She's too much of an acidic bitch for that anyway. (This is why they are friends.)

Severus makes a noise that might be acknowledgment, and sharpens the cherry of his cigarette against the edge of the ashtray. He quirks one eyebrow when he glances at her. Yes, hello. What?