You and another demon slayer were sent on a mission. You didn't find out until receiving the mission that you were going to be traveling with Zenitsu... Joy, joy.

You were fully expecting him to start panicking and crying as soon as he heard about this, but today, he stayed really quiet. At first, you didn't think much of it. Finally, he was shutting up. But as soon as you two were far away, you heard him cough quietly. You look over and notice he looks a bit pale, and his cheeks are flushed. Was he sick...?