Kovu stares at Beastboy's hand for a second. He knows the handshake gesture by now, he's seen it a dozen times, but he still doesn't like it, or get the point of it at all. But after a moment of considering he decides it'll be better to just do it and get it over with, so that Beastboy won't whine.

He grasps Beastboy's hand firmly, rolling his eyes.