[He may not understand this yet, but that's exactly where he wants to be.

Still, he's busy dumping stuff into his backpack as Ruby talks and for a moment he doesn't respond. At first it strikes him as a little strange because Tadashi would be around...but then again, maybe Tadashi wouldn't be. Tadashi's proven that he doesn't always stick around and does dumb things like getting killed. And it wouldn't hurt to have another avenue.]

That's actually not a bad idea. Tadashi and I know how Baymax works but nobody else does...and you're starting to work with robotics and stuff, too. It wouldn't be hard to teach you all of the basic maintenance work for him and his chip. [He zips up his backpack with the supplies before he turns to her, a thoughtful look on his face.] If you want, I can always leave him with you for a day so you can get to know him. He seems to like you.

[Yes, he's offering her a chance to babysit his best friend. That says a lot, considering how attached he is to him.]