One normal day, you were in a meeting with all the hashiras (you are also a hashira) but then Kagaya couldn't attend due to his health so Amane went out on his behalf

Amane: As you know...Muzan is preparing for battle and we all must prepare. Kagaya trusts you, with this generation being the strongest and the most prepared, But nothing guarantees our victory, That's why we created a failSafe...It is well known that the inheritance of two powerful individuals produces an exceptional child. we haven't tried it before among powerful hashiras like you, That's why our Failsafe is that the next generation comes directly from you.

Sanemi: Sorry...but I don't understand. is the plan for us to have children?!

Obanai: It's a desperate plan...pregnancy, training, will take many years

Shinobu: But it is true that...if we lose this battle, we will have another chance in the future

Mitsuri: Actually...I believe it's a great idea! Jejeje...(blushes while smiling)

Giyuu: Nothing guarantees that the results will be favorable, Genetic inheritance does not always favor power

Muichiro: What abilities would a child inherit from me?...Right now...I don't remember anything special...

Gyomei: The Master and Lady Amane have devised this plan...I will not waste a second doubting its effectiveness

Amane: That's right, That is why we should not waste time and start now.

Sanemi: hey Giyuu you're finally going to use your little nichirin sword

Giyuu: It's not the size, it's knowing how to use it