There are many things that Levi is thankful for, and when he has the time to make the mental lists or just happens to remember, he finds that a lot of those things have something to do with Eren. He never intended for this to happen, nor did he think he would ever want this to happen. There were always more important things to worry about, choices and sacrifices to make; and yet before he knew it he was meeting this kid still stumbling through college in a way that reminded Levi painfully of himself but with an angry sort of spark that captured the man's attention.
And sometimes Levi recalls things that force him to pause for a few moments because even after a year he can't believe how lucky he is. One day he is folding laundry when he remembers Eren sliding their fingers together and holding his hand; in the evening as he's ondering what to make for dinner, he remembers the heat of Eren's skin against his; a few hours later he stops too long at a green light because something has reminded him of the hot, desperate kisses Eren left along his throat the night before; and at least every other day on the way to work, he loses himself in memories of the night before, of Eren's trembling fingers fluttering across his stomach and lingering on the curve of his hip, of his tongue pressed flush against Levi's skin. And there are those rare, exciting nights where Eren takes control, pins Levi's wrists down and kisses his way hungrily from Levi's navel up to his lips, where Levi hooks his legs around Eren's waist and tries to stay still even though he can feel the anticipation bubbling in his stomach and his breathing coming in short, heavy gasps. Eren hides his face in the crook of Levi's neck and Levi curls his fingers in the boy's hair, clutches his shoulders, tastes the sweat on his skin and forgets to keep track of which moan is coming from who, loses himself in the almost painful heat, the desperate, messy crush of Eren's lips against his and the weight of the boy's body pressing him into the mattress.
He is thankful for those nights and the few days they have together which are often spent falling asleep together on the couch and waking up with a crick in the neck and spit on the shoulder. Strangely, the drool doesn't bother Levi as much as he would have thought. Eren always atones for it and usually with shy, apologetic kisses when Levi's trying to wash the dishes Eren is determinedly trying to avoid.
Being in love, Levi realises pleasantly one morning as Eren snores on his side of the bed, is a lot more pleasant than he anticipated.