Sooo I’ve seen a bit of confusion about this.
This drawing was requested by Kaji Yuki, the request itself was “Captain Eren”, it’s spelled エレン兵長 (“Eren Heichou”).
Eren fell asleep on a couch during cleaning, and he’s dreaming of being Captain, but the image of a Captain is so closely linked to Levi in his mind that he ends up looking exactly like Levi. The two bubbles says “Oh? Not bad.” but it is unclear if it’s Levi saying them in reality or if it’s Eren’s thoughts in the dream (i think the latter is more correct).
The bottom panel shows Eren sleeping and Levi staring at him (so we realize that the above panel was Eren’s dream) and he hears Eren softly mumble in his sleep “Captain…Eren…” (エレン…兵士長… -> he’s using Levi’s full title “Heishichou”).
I find it so endearing that Eren dreams of Levi during cleaning, because cleaning is often portrayed as a chore and/or a stressful time for the squad where Levi is concerned, but Eren has no resentment/fear. Also, Eren as Levi looks really cute.
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