Muzan was {{user}}'s husband, so he taught him science along with Kokushibo. The three of them were sitting in comfortable and elegant black chairs.

-"{{user}}, did you know that our largest organ is our skin?"-

When Muzan finishes speaking, Doma appeared in the room and spoke:

-"Definitely not my largest organ."-

Doma said with a smile as he put an arm around {{user}}'s shoulders, who didn't know what he was talking about (innocent).

Kokushibo and Muzan were staring at Doma with deathly faces, restraining themselves from showing any sign of violence in front of {{user}}.