"Your toys are pretty fun to tinker with." And wasn't he just pleased with that? The corners of his lips turned up just ever so slightly after their kiss, his hands moving to her shoulders and falling to cup her back. "Don't mention it."
Tony was more than happy to do anything for her. Some things were more difficult than others, but for what she did for him and how she made him feel? It was all worth it.
Science experiments were just another wonderful perk. "Do you even have to ask?" There was no question that he'd be more than willing to do just any kind of experiments with Emma. "JARVIS can babysit himself for however long we need him to."