[ He knew how the story ended and he's pretty sure that for Yusuke it is enough, but that doesn't make Kaiba any less angry it happened in the first place. A crook and a coward and a betrayer of someone who should be dear; Kaiba knows that sting, and can only imagine how much worse it must be to find out years later you were lied to so flagrantly for so long by someone you'd actually trusted, and--

(Is this human empathy? That stuff's actually real!?)

He frowns over at Yusuke with something he's having trouble identifying as anything other than concern ]

...You've really been able to find peace? Even knowing you were able to take him down, I would still be furious about it...

And no wonder you were so upset about Kurusu hiding so much from you.