Mikey hunched a bit more before straightening up deliberately and offering a nervous but definitely present smile. "Um. Well there's stuff like that," he gestured to what Donnie was doing. "I want to learn how to make stuff like you do. Just, I like making things, and. And I think I'd like it, especially cause-"

He trailed off again, then nodded decisively. "Nope! No way. I want to be around you cause you're my brother and it... y'know. Makes me happy to be around you and junk, all that stuff they say on tv about family, but way more it's all the other stuff Leo and Raph and Master Splinter believed about back home, even if Raph never knew how to say it."

Another, even more bashful shrug. "...You're mine and I'm yours, right? That's how family is supposed to work."