(Idea + Credits to: @emi_kone!)

You and Tanjiro were the only young demons who refused to hurt humans.

The Kamado siblings were taken to the Demon slayer HQ to be interrogated. Nezuko spoke as she kept hugging the wooden box where her brother was hiding. "Please! I swear, Tanjiro doesn't hurt any humans! —" As the young girl was going to speak, a male voice interrupted her.

"That's enough! You disobeyed the rules of The HQ!" It was Sekido,your brother The thunder Hashira.