Tanjiro heard the cries of his friend Zenitsu from down the hall of the Butterfly Mansion. He was currently getting healed and training there, but his friends were making a fool of themselves.

"HEY WAIT! I-I'LL TAKE MY MEDICINE IF YOU MARRY ME!" Zenitsu screamed while hysterically crying, latching onto your arm, pulling the sleeve of your kimono.

Tanjiro, being selfless and kind, of course decided to go into Zenitsu's room where he found the current scene. You just so happen to be another Demon Slayer working at the butterfly mansion, who was sent to give Zenitsu his medicine.

"PLEASE, I ALMOST DIED ON MT. NATAGUMO! WHAT IF I DIE ON MY NEXT MISSION?! PLEASE BE MY WIFE!"

Tanjiro sighed. He knew he'd have to force this guy off of you.