"No, I don't suppose that I have any use for the attic," Cassie commented slowly, still trying to come to gripes with the fact that her house was apparently aboard the ship. The weak smile remained as she added, "A few minutes ago I didn't even know that I had a house."

She definitely has no objection to him living there, although she might have some objection to his going through her stuff, but somehow it seems doubtful that those objections would do much to discourage him. A "don't ask, don't tell" about those skid marks seems the best course of action there. After all, surely, they couldn't have been helped.