Meh, Kazahaya is not used to personal space or personal property anyways. At his last place, he and his roommate just have one shared room (and may accidentally swap beds from time to time?), so it's all good. Normal roommates are for quitters!

(And Kazahaya, when he's not being a clueless boy, has some A+ levels of empathy, so if Kid is feeling down, he will notice and try to help.)