For once, the only thing Eren is lost in is Reiner, not his own head. Embarrassing, really, but he doesn't bother letting himself be embarrassed. They've been holding hands this whole fucking time, after all. Who cares if they're staring at each other like idiots? Who would see? If anyone they know sees, Eren doesn't care anyway.

Eren does almost argue about the paying thing, opening his mouth to remind Reiner whose birthday it is. But he shuts it again. It's not like money matters to either of them, he's pretty sure, and Reiner made it clear he wanted to celebrate Eren's birthday all these months later.

"...Okay."

Eren has a vague idea that "milkshake" is like "ice cream" from seeing one before but he's never had one. He can't imagine blueberry ice cream though, so that's enticing.

He lets Reiner pull him to the table and slides into a seat, finally (reluctantly) relinquishing his hold on the other boy's hand.

He stares at the disc thing. Buzz? Like a bee? How or why? That's a complete mystery to him too. Why don’t they just call names like normal? Whatever.

"I have no idea what that thing is," he says. "The technology here really is nuts."