River didn't mind her leaning against him, no, but he wasn't about to make an effort to make any more contact than that. With Derek here, he was not only quieter, but not as affectionate. He simply reached his hand out, gave her thigh a tiny squeeze, and lifted his hand back off and went back to eating.
Derek was eating and engrossed in the show, not paying attention to what was going on on the other bed. If they cuddled though, that was okay. He was affectionate with Kirsten in front of Alyssa. It was only fair. "A something runs something something." Derek said out loud, trying to figure out what the whole thing was.