He's definitely being awkward, but how is he supposed to argue with that?! Toshi swallows hard, trying to keep down another undignified sound. You are way too much, Mettaton. "I'm not used to... such enthusiastic interest." Or really anything about you, Mettaton. He is totally unprepared.

"W-well, I'm not really a hero yet. I like the idea of it but... I don't like fighting." Or rather, he doesn't like what fighting reminds him of. He doesn't want to become a mindless violence machine again.