He goes with Liberatio

Muzan shouldn’t be entertaining this being. He was the monster that would consume all humanity, wield all the power. And here comes this ‘true demon’, conveniently telling him that he would give him the power to conquer the sun. Muzan had been fruitlessly searching for the Blue Spider Lily that would perfect him for centuries. How could this being be the answer to all his problems?

‘And yet, if the answers truly were beyond this portal…’ Muzan thought. 'This has to be a risk worth taking. And if this is a trap, I can always fight my way out.’

“Very well, Liberatio.” Muzan said sarcastically. “I’ll indulge you. Just be sure to die quickly once your trap fails.” Muzan doesn’t take the offered hand and they both walk through the portal.

Upon entering, Muzan came out on a sight that assaulted his senses, his very mind. He was on a balcony high up a tower in a corner of hell that Liberatio called home. Muzan took in the flames, the reddish-orange sky, and the desolation of the infernal realm around him as he could hear screeches and screams in the distance. He focused his senses, made sure he was still intact and that what he was seeing and experiencing was real. ‘This is hell…’ Kibutsuji thought as he took this all in.

Muzan turned to Liberatio, who closed the portal and looked at him with pride. “So, do I have your attention yet? This is only a fraction of the power I have accumulated across the centuries.” Muzan felt the power radiating from the blonde, power similar to his own.

“Alright… so, do you really have the power to conquer the sun?” Muzan asked. He felt his blood stirring, sensing that ultimate power could finally be in his grasp.

“I have that and more.” Liberatio answered. Muzan barely held himself in check, reminding himself that he was in hell and Liberatio could **** him to stay here permanently if he was not careful.

“What do you want from me, then?” Muzan asked. “I doubt you invited me here just to give me a tour of hell.” Liberatio approached Muzan, the beings gazing into each other’s red, malevolent eyes.

“I’ve been wandering the Earth for some time. Watched kingdoms rise and fall to ruin, looking for the one who could bring hell on earth. You have attained demonic essence, yet it is incomplete. I can use my blood to perfect you, turn you into a true titan of demonic power like me. There will be no more worrying about the sun, and no conventional weaponry can stand against you.”

“Conventional?” Muzan asked.

“The blades and weapons the Demon Slayer Corps make, the materials aren’t just perpetually forged in sunlight, the constant sunlight makes them blessed from the heavens. Once you destroy the Corps and their knowledge of making those weapons, Japan will be yours for the taking.”

Muzan’s blood once again stirred. “I see. Again, what is your price?” he asked.

“I require 2 things.” Liberatio said. “The first is that you see your goals through. Bring humanity to its knees, unleash a new demon order made on top of the fallen mortals and any heavenly beings that get in the way.”

“And the second?”

Liberatio smiled. “I want to be your partner in this infernal endeavor. Not as a demon underling, but as your equal…”

Liberatio slowly put his hand to Muzan’s cheek. “…and your lover.”

Muzan narrowed his eyes. Was he serious? “Lover?”

“Yes.” Liberatio said. “While we’re not lording over the humans and other demons, we will live hedonistically and fuck each other into our bed. The power to change everything is right in front of you.” Liberatio puts Muzan’s hand onto his waist. “Let’s join together, Muzan Kibutsuji, and create carnage and mayhem unlike any the world will ever see.”