"I'll leave you a corner." A concession; not one Sherlock would normally make, but he gathers they're important when one wants to keep people around. He's not terribly good at that. Never has been, but he means to try, this time.

"Has to be near the refrigerator though; easier to store samples." And obviously he'll have to store samples. There'll be room; it isn't as though anyone needs more than milk and a few scattered food items anyway.

Though maybe John would want more. Maybe. He never can tell with other people; they're all different, and this isn't something he can just deduce. There are tendencies, Sherlock can guess how he'd like his tea, but it's not the same thing as evidence and knowing.

"Definitely a corner. You eat, I'll work." Or watch. Or both.