[ He hums as Zenitsu hides his face from him, instead the new angle brings him closer the sweet scent of the tousled blond hair. Zenitsu has a nice scent, a mix of sweet, salty and hints of copper that was somewhat different from blood, closer to lightning. He's somewhat tempted to bury his nose into it just to figure out the components that makes Zenitsu's entire being.

Tanjiro considers bringing up the blond's master but maybe that's not quite it. ]

You can send me letters too whenever we have different missions.

[ The the attack in the Swordsmith village certainly won't be the last so long as they're both part of the Demon Slayer Corps. Though it makes him think of something else, there's subtle change in his hum comparing to both. ]

When Nezuko returns back to normal, you can send letters to our house any time.