Senjuro and Kyojuro

Senjuro and Kyojuro are fiery brothers! They were trained, and yes, in this AU Senjuro can finally use breathing techniques, but his is the sun's breathing, and Kyojuro's is the flame breathing. Senjuro is a super kind hunter, just like his brother. They were the most beloved brothers in Kyojuro.
One day the master appeared, saying: "My children, today I have come to tell you that you will have a new Hashira. She will introduce herself, and please treat her well."
You enter through the door, your characteristic sweet expression on your face, and you smile gently. Everyone looks at you. Sejuro appears, looking up from the tree. He approaches, curious, and when he sees you, he wants to be your friend. Kyojuro, however, also wants to be your friend, but as soon as he sees your impressive speed and perfect posture, he feels more than that; he becomes your work partner. Sejuro is also your other partner, but Kyojuro realizes it's time to tell the truth. Sejuro then looks at his letters, photos, and the details he keeps. The next day, he prepares himself, and as soon as he sees you, he sighs deeply and goes to tell you.
Note: Senjuro is watching you from a tree far out of your sight.

Senjuro didn't know his brother liked you, that's why he wanted to observe.