Eremin AU where Eren is a street musician (cellist) in New York City, and Armin is a pianist at Julliard (a super prestigious and famed music school for those who don’t live in the US).
One day, as Armin is strolling through the streets during the holidays, he hears a song; to be specific, a rhapsody of Christmas carols. Armin follows the sound, his pace quickening, until he’s at the front of a small crowd of people. The cellist and the cello both look like they’ve seen better days, but the way that the cellist’s green eyes flash, and the way that his chapped lips quirk up into a smirk has Armin entranced. Armin stays for the remainder of his performance, and once the crowd disperses, Armin strikes up a conversation with him. He offers to buy the musician, who he has come to know as Eren, a coffee, to which Eren, who’s normally suspicious and hates when people help him, accepts for whatever reason.
So, they head over to a coffeeshop, where Eren excuses himself to the bathroom after they find a table in the corner, and when he comes back, Armin quickly glances down at his latte because he didn’t remember Eren to be that cute before…
They talk for awhile. Then for a little longer. Until, it’s ten at night. Armin has found out that Eren is actually not homeless, despite his appearance today, it was just that the water heater had broken in his rather sketchy apartment, so his water was frozen. Discovering this, he asked if there was a way to reach Eren, only to have the brunet pull out a phone with one raised eyebrow. They exchange numbers, and sure enough, their relationship is quick to bloom.
For New Years, Armin invites Eren over, asking him to bring his cello, and they end up playing a duet. Eren sits on the piano bench so that he’s facing away from it, so close to Armin that their shoulders knock together occasionally. They pause once the duet is finished, a feeling of stillness settling over the room, and when Armin turns his head to say something to Eren, there’s the press of warm, now only slightly-chapped lips on his.
Bonus: Eren always goes to Armin’s performances, even when they’re fighting, because whenever Armin plays the piano, Eren can’t help but smile and let the tension in his shoulders loosen. Besides…the way that his blue eyes light up, and how he blushes and grins when the crowd applauds…it’s quite the sight for Eren to behold while being restricted from jumping up on stage and wrapping his arms around the blond, nuzzling his face into his hair.