"Maybe you sleep walk?" Sirius offered, arching a brow at him as he nodded his head slowly. "Yes, that might be it. Terribly dangerous though, sleep walking that is." he informed him, giving him a slightly concerned look before standing up. "And, yes, but my stances on things are usually correct. You wound me by blatantly disregarding them!" he teased, though if his hiding Remus's books said anything about it - it was clear that at least some small part of him was irked by the fact that Remus spent his free time reading. Time he could be spending having fun. With Sirius. Sirius thought he was much more entertaining than textbooks, thank you very much!
"Of course! What are friends for, Moony?" Sirius replied, crossing his arms over his chest. "Now - you said you had them in your bed last?" Sirius asked, tapping a finger against his chin as he thought. "Maybe .. they're in the kitchens!" There was absolutely no connection there, but that was what Sirius wanted to do. And then maybe go sit out by the tree by the lake since it was nice out. Remus would believe his books could be out there, right?