And going off that last head canon, Eren just eyes Levi for a moment before blushing& thanking him. But, then she/he's frowning a little & when Levi asks "what's wrong?" Eren replies- "Your shoes and skirt don't match at all. Also, your leather jacket doesn't go to well with that shirt But, you don't have to do this. I'll wear my skirts and stuff again." so, Eren goes to change into one of her/his new dresses, Levi changes into a nice suit and during dinner- he gets down on one knee & proposes.
lies down slowly