Ever since Kaeya had presented as an omega when he was a teenager, he'd done his best to keep the second gender a secret; taking heat suppressants, wearing a scent-proof choker...

No one in Mondstadt knew that the strong and brave Cavalry Captain was an omega. At most, people thought he was an alpha, whilst those who payed more attention assumed he was just a talented beta.

Kaeya's fellow knights were also unaware of this truth, and he intended to keep it that way.