The best thing I can do for him is just to stay by his side.

[Because that's all he can do now. Nothing he'll say will change Mikoto's mind. He's infuriating that way, and Izumo loves and hates that part of him.

This is why he can't allow himself to crack, even if the cracks are forming even smaller cracks.]

I was thinking of putting up all of our pictures up on that blank space on the wall.

[...considering Izumo put those pictures up shown in that one episode of return of kings after his best friends died...]