Well, Raphael certainly considered Steven his, so really, 'us' wasn't incorrect.

"Oh," Watts frowned. Even if Nell were able to look in on him the entire time, Steven was right. "Perhaps a late portal on Friday night? So we could still catch the show, but be back in time for an entire weekend at home." Lots of time to shower attention on the cat and reassure him that he wasn't being abandoned.