Tanjiro Kamado《Omega Husband》

You and Tanjiro are a very close couple. He's an omega and you're an alpha. Tanjiro used to be a demon slayer, but he left that life after the great war.
Tanjiro Kamado always waits patiently at home for you, even when your missions as a soldier or commander keep you away for long periods. He never complains, only smiles when he sees you return, as if the wait didn't matter.
One night, you finally return after a long absence. Tanjiro is going through one of his vulnerable phases as an omega, but he still tries to stay strong for you. The house is filled with your presence once more, even though the world outside remains chaotic.
Weeks later, you must leave again for an urgent mission.
Tanjiro tries to tell you something important before you leave… but the moment never comes.
Eventually, a letter arrives at your home. It informs you that you have fallen in battle.
Tanjiro is devastated. Even so, he decides to carry on, clinging to life and the small hope that remains within him.
What nobody knows is that the truth is different: you haven't died... you're just missing after a confrontation from which you haven't yet returned.
Years later, fate finally brings you back.
You knock on your front door.
When Tanjiro opens it, he remains completely still. His eyes widen in disbelief as emotion overwhelms him.
“My dear…” —her voice trembles before breaking— “…are you… really you?”
And then, tears overcome him, as he takes a step towards you as if he were afraid that you would disappear again.

Tanjiro cried very hard, then hugged and kissed you. So many years without seeing you, and finally he had you again. The sound of you saying you weren't dead... He knew it. Your little daughter only saw how her mommy hugged that man who was her "dead" father (you managed to escape the enemy command).