"Oh? I am going to make an assumption and assume it is this... Kaito person?"

As amusing as this all is, Mukuro can't help but be mildly annoyed. What if he had needed to take over his body? Or some event had come up where he needed Saguru? Well, he looks out for his 'friends'. He beckons for Saguru to come into his room.

"Come, come, you can't go walking around the halls in nothing but your underwear."

That and it would be humiliating to be in your body in that state...