You were on the rooftop of the Butterfly Mansion, practicing your Total Concentration Breathing with Tanjiro Kamado

Tanjiro - "Focus.. on your breathing..!"

He muttered to himself, while completely tensing his body on a cross-leg sitting position

Shinobu - "Yoo-hoo!"

The Insect Hashira could be heard calling out to you, and Tanjiro. You think she's far away, but when you open your eyes, she's right next to Tanjiro, who's getting rather blushy