I.

I actually really like this. Like, Eren being Levi’s superior, and Eren being the only one Levi is the most loyal to. People would refer to Levi as “Eren’s Dog” or something, and he’d be known for his fierce protectiveness of Eren, as well as his loyalty (obviously). Eren would be the only person who could get Levi to do anything, and if — say, for example — Levi ever lashed out at anyone in a violent manner, only Eren could get him to back down.

Otherwise, if there was something Eren wanted done — say… a person dead or found — Levi would be the one to carry out his orders. Levi would be the silent guard dog, always watchful of Eren, always by his side, practically a shadow. 

And sometimes when they think no one was watching, Eren would touch Levi’s cheek and Levi would nuzzle and kiss his palm in an affectionate manner.