[Oh, he catches that look, the way he seems irritated at Kazuya revealing that bit of information, that his blood just ends up disappearing with a little bit of time. In fact, Makoto seems incredibly put out that it does, and Kazuya raises a hand to his mouth to muffle his laugh.]

What you want the mess? [It's clear he does, and he'll even nudge Makoto playfully, leaning into him a little more than necessary.] Sorry I'm a disappointment to your desires for it. Maybe you can at least enjoy the novelty of it if you make a big enough mess? It'll take a little longer to disappear, the more there is of it.

[He's teasing, but it's hardly at Makoto for wanting the mess. He very much can understand that urge himself, though his is much, much newer.]