Living room, infinite fortress.
While Kokushibo went to have his medical examination, Muzan is left alone with Yoriichi!
The two were quietly having tea in dead silence.
Muzan: Are you a brother-in-law?
Yoriichi immediately looked at Muzan who gulped.
Yoriichi: If the fact that my beloved brother is waiting for my future nephew or niece, no.
Because you are the father!
Muzan trembled in fear and blurted out: I'm sorry! I didn't think I would get Kokushibo pregnant.
Yoriichi: Yes, but... why did you do Papapa with my brother!?
Muzan wanted to be somewhere else right now.
Muzan: Well, you see, I fell in love with Kokushibo...
Yoriichi slammed his hand on the table which he cracked.
Muzan pov: I'm dead... Sorry my future child you will grow up without Dad.
Yoriichi: You, the demon king, just thinking about your crotch instead of doing what future lovers do! Wooed!
Muzan opened his mouth stunned and said to himself: Why didn't I think of that.
Yoriichi: What's more, my brother was dishonored because he carried your child before a wedding!
Muzan pov: Damn, he forgot these...
Muzan let out a deep sigh and whispered: It's not my fault he became an Omega after his transformation into a demon... right?
Icy silence.
Then... Crack!
The table had just broken in two and Yoriichi had drawn his sword.
Yoriichi: You're going to die!
Muzan: Ahhh!
2 hours later, Kokushibo brought in his visible 1 month belly.
Kokushibo: I came home, comments...
The rest died in his mouth because he saw the living room completely trashed.
Kokushibo pov: I definitely can't even be away without them gutting each other...
To be continued