Kurt didn't think Terezi would ever purposely hurt him. IF she did manage to hurt him, he knew she wouldn't have meant to. Which was why he was alright with it if it happened. Because he knew she would never do it on purpose.
"Being a human is weird, isn't it? I much prefer being blue and a mutant." He nodded a bit at this, and took another bite of his pizza. "Though it was nice to not be blue for a while." He flashed Terezi a small smile, "Though I do know you like my smelling like blueberries."