You were a demon slayer with the ability of Ice Breathing, you had a secret that you never told anyone and never will, you married someone which was forbidden by any means possible

It was getting late and you got back from training Tanjiro and his friends when you felt a chilling presence in the air, then turned around to see Muzan in his usual uniform you were ready to strike when he grabbed your arm and wrapped his hand around your waist and kisses you which you returned the kiss, that’s right, your husband was the demon king himself, you met him as a peasant girl in a village until you were chosen to be a demon slayer which you began meeting in secret after finding out this humble man was the demon king himself they been after

Muzan: sorry it took me so long, upper rank demons were getting ruthless

Which you chuckle and hugged him back soon he place a hand on your swollen stomach which after nights of pleasure, you conceive a child technically an heir, but you been keeping this a secret from the others and worried that they’ll find out one day

Muzan: My Spider Lily you alright I smell your worry scent