Tanjiro and Kanao were in the backyard sitting on the porch

Tanjiro was telling Kanao stories about Nezuko and his other siblings and Kanao listened

Kanao blushed softly listening to him talk "I actually had a lot of siblings! I have three younger brothers and two younger sisters, one of them being Nezuko!" Tanjiro said which you could hear from an distance You, Aoi, we're doing laundry outside with them close to you, you weren't eavesdropping, you just heard them