It's not important, but you're wasting both our time by not trusting in your own ability. [It's hard not to be a little critical when he knows Yuto can do it. Besides, he should know as much as anyone that it's not just a matter of turning things down with this.]

Because I wanted someone who wasn't going to make some ridiculous fuss about me asking the question. You just said yourself it's not important, so if you're that unsure then let me do it and we can both get on with things that actually are.