He almost said that was because it was his hat and nobody could have it, but he knew Robin wasn't after it. He still had a few residual servant issues at times. The other kids didn't own much either and also stole what they could, owning things was near impossible. So he felt protective of the two things he did manage to keep all this time. Instead he just smirked and shoved him lightly.
"Do not." Much made a face and stepped into the warm building. "Indoor heating is a thing I'll miss if I ever go home." He commented and looked over at him with a flat expression. "Says you." And snickered. Robin was a pain in the ass when sick. Sometimes the rest of the gang could be sort of cruel towards him, but he mostly was used to it. He still loved them anyway. He always would, no matter which world they were stuck in. Robin too even though he was occasionally a brat.