[This is truly so funny because D is trying so hard to say something sweet and nice but the only thing Matsui takes from it is a REMINDER OF ALL THE THOUSANDS OF LIVES HE'S HELPED TO SNUFF OUT AND HOW MUCH LESS BEAUTIFUL AND MAGICAL THE WORLD IS BECAUSE OF HIM!!!! IS HIS LIFE EVEN ENOUGH TO REMOTELY SETTLE THIS DEBT!!!!!

He stares at their covenant hands, where his is being held so carefully, and probably disassociates for a second as he envisions them covered in blood.]

...You are a kind person. Thank you. Ideally, matters won't come down to this in the first place, but... I can't leave anything to chance. You understand.