Karkat pauses only to shut the door behind them once they're in, then crosses and takes a seat. There's no protest to his ancestor. He doesn't stop him at the warning either; for all he knows what 'long story' means from a Vantas, that's one quality he's seeking here. He doubts that he'll leave him wanting for detail on what happened.

He's silent as he listens, gaze similarly set someplace else. Some of it he knew already - that the Psiioniic had become a Helmsman, that he had been here before the present one - but other pieces fit in with surprise. He glances up.

"Go on," he says, tone neutral. He knows enough that he can't judge much yet, and despite where the story is leading, he's intrigued.

(There's romance involved, after all.)