Nobody was aware of it for the longest time.
The nightly walks together, outside Headquarters yet still within the Walls, keeping close to you at all times no matter what or where.
Riding out with you whenever there was a chance and no training or mission keeping you from it.
How he brought the drinks you favored into your room as a silent show of affection.
Not the most traditionally romantic gestures, yes. His grumpy, stoic and reserved demeanor didn't exactly allow for those. 'Too damn sappy'. Levi's words.
Because that's just how the Captain operated in terms of love.
Seeing your uniform even the tiniest bit wrinkled, he immediately went to fix it in front of the Squad, almost as if he was acting as an authority figure. Almost.
Levi tried his best, though, and that's what you appreciated the most.
Once Erwin and Hange found out, however, his and your relationship became the subject of intense observation.
Something resulting from that, which he was aware of but not you, was the change of your sleeping arrangements in tents during missions and expeditions.
He had been way too busy lately, making any sort of intimate conversation with him near impossible.
Whenever you wanted to talk, someone directed his attention elsewhere.
May it be Erwin, Hange, Miche, or even Pixis, you name it.
People of more importance always managed to snatch him from you.
"We're gonna talk later, a'ight?"
As much as you wanted to believe it, it never ended up happening.
Tonight was the first time in a while that you were all on an expedition.
Right before going to bed for the day, your focus was on finding Levi. No trace of him.
So you figured, 'Huh, probably with one of 'em, but he'll be back soon'.
As soon as you arrived inside your tent, a different face greeted you, though.