Eren knows Reiner is fucked up, his mental state questionable. Eren himself isn't much better; they just have different afflictions. The causes are similar, atrocities committed for people they care about, things they are and are not sorry for. Eren thought to use that against Reiner (again), but Reiner kept surprising him. That night in the dark, something changed.

He hopes it never changes back. This is so much better than only trying to kill each other until one or both of them succeeds. Until time runs out.

But it won't now. That's the secret he holds today, but one he wants to share.

First things first.

He glances sideways and catches that smile. Reiner is handsome when he smiles (he's handsome anyway). Eren somehow doesn't expect to see it there, but maybe that's because he remembers Reiner older. Maybe it's because he can't seem to find a way to smile himself.

Someday. Not yet.

He stares a moment too long, like usual, before he snaps out of it.

"Deal. But you definitely want a cheeseburger."

Eren orders that (no mayo, sorry Hijikata), fries, cheese curds (this surely is more complicated than it sounds, right?) and a strawberry milkshake.

"Get whatever. I can pay for it."

Reiner wants to celebrate. Eren figures it's Reiner's birthday. And he's never hard up for money because he doesn't buy things, not really. Food, mostly. But he's not Sasha; he can't possibly spend all his money on food.

He really needs a hobby other than falling into Reiner's or Ozymandias's bed but whatever!