He goes along with her willingly. "Second drawer," he tells her.

While she's looking for pajamas, he pulls up his restraints and puts them on the bed. "Is this because I told you I loved you?" Malcolm asks. "Has it activated the part of your brain that makes you want to be a caregiver?"

Maybe it just gave her an endorphin high. He's not mad about it at all, just curious that she's so intent on taking care of him.