Sensing people approaching the mansion made Logan itchy until he pinned down the scent or the sound and identified just who it was walking into their perpetually-unlocked front door; once that was settled, well, it was a matter of responding appropriately, with claws or by actually sticking his head in to say hello.
In this case, the slight tang of steel was familiar, and meant that he ambled downstairs to go welcome home the Russian by thrusting the art class back into his hands. He was sure the students would be duly grateful to have an actual art teacher back: he certainly would be, and not just to have to deal with one less class.
He wandered down just in time to hear Bobby explain where Jubilee had gone, and Pete's confusion as to the matter. "'Ro won't be the only one," he said as he wandered over. "Good to have you back, Pete," he added somewhat belatedly. So this was what it felt like to be the one to welcome home the wanderer; he was usually the one walking in the front door from places unknown. But now apparently an entire generation of X-Men had taken his nature to heart and gone off elsewhere. He was almost proud.