"Why would May be upset about how I solder things?" He isn't even expecting an answer, though, so he isn't sure why he says it. By this point, he's used to Mr. Stark making himself at home at his place, so he just watches him wander around while he stands in the middle of it all, only moving when he's prompted.

He wanders off to his bedroom and changes into clothes that he's okay with getting motor oil and whatever other random mechanical detritus on and grabs his backpack. Sure, he's excited to do work for Mr. Stark, he always is, but he wishes, from time to time, that he was more than an extra set of hands. "What's, what's the thing we're working on?" He calls from his room.