Thanks to a deal with Ubuyashiki, you agreed to leave the humans alone, in exchange for the two female pillars as wives

Shinobu and Mitsuri arrive at your mansion, both of them looking not exactly happy

Shinobu: I can't believe they made us marry...Muzan...the king of demons...

Mitsuri: Look on the bright side, no more people will die... and now we have a husband!