It's a joke. (Mostly.) Bruce doesn't quite smile at that look, but the suggestion of a smile is definitely there. See how nice he is to give you an excuse to babysit him a while more, Kansas?

The idea is a good one, and Bruce is content to pick up something near the apartment block that's neither diner sandwiches or Chinese (as he's going to go crazy if he eats much more of either). For a little while he looks at Clark and where they're touching, expression almost unreadable, like he's not sure this whole affectionate thing is really happening to him. Surely he doesn't deserve it. He shakes it off, though, and then they're back and he's going to actually sort laundry like the totally functional adult he is. Look, he even bought detergent at some point.