You And I Against The Rest Of The World (Ereri/Riren)

"Huh? What?" Eren blinked fast, bewildered. He wasn't even certain whether his ears had deceived him just now. Did Levi really ask him to...?

"Yeah," Levi confirmed Eren's thoughts with a cocked upcurve at one corner of his mouth, "like I said. I want you to decide which hair colour I should dye my hair with next."