Yes

Muzan didn’t move to get Liberatio’s hand off his cheek, or to move his own hand off Liberatio’s hip. Astonishingly, he didn’t sense any hostility or deception in the hellspawn. He genuinely wanted to help in his quest to destroy humanity and create a world of demons. This revelation left him in a rare state of awe.

“Ok.” Muzan said. “You’re serious.” Muzan gazed into Liberatio’s eyes and he began understanding him as more than a partner in his malevolent goals. He found a kindred spirit, one who sought chaos, ****, his own selfish desires, and more.

“So, are you accepting?” Liberatio asked, aware of Muzan’s thoughts.

Muzan smiled as he took in his incredible fortune. “I’ll accept such a generous deal every time.” Muzan firmly grasped Liberatio’s hip, the demon turning into it. “So, about conquering the sun and unleashing my full potential, what do I need to do?”

“The process is surprisingly simple. All that’s needed is a demon who knows what he’s doing, and a ritual. Come.” Liberatio took Muzan’s hand and led him inside the tower, which looked the part of the home of a high ranking demon. There was a bed and the walls were adorned with weapons, skulls, and various instruments that promised **** and pleasure. At the center of the room, on a cold, barren floor, was a large, ornate symbol that radiated with demonic power.

“Alright, Muzan. Remove your clothing and step on the pentagram.” Liberatio said as he took off his shirt, revealing muscles built through the years. Muzan blinked, even though he was taking in Liberatio’s body.

“Must we really be naked?” Muzan asked.

Liberatio smirked. “Well, we could do it with clothes on, but you’re about to get everything you’ve wanted and I’m about to introduce and unleash a whole new chapter in your life. Let’s make this special.”

As Liberatio stripped fully naked and stepped on the pentagram, Muzan took in the sight and felt the many thoughts swirling in his mind: his time as a pathetic human, his early years as an oni, his nightmares of being killed and sent to hell. Now, ultimate power was within his reach. Everything he had done had led to this.

“After a thousand years, everything is mine.” Muzan said quietly. He stripped and joined Liberatio on the pentagram. They got on their knees in the center.

Liberatio raised a hand, a sharp nail coming from his other hand towards the open palm and it began cutting. “Cut your hand and embrace it in mine.”

Muzan did as he said, not feeling a thing. Muzan could feel their blood mixing, both inside and out, as Liberatio began chanting in Latin. Muzan didn’t understand the language, but he felt their blood mingling from their connection. It was sweet, like he devoured over a dozen people with Marechi blood.

The chant Liberatio was reciting grew louder as they gazed upon each other and placed their free hand on each other’s bare, muscular chest. Muzan began breathing heavily in anticipation as warmth spread through his entire body, the pentagram lit up with a red glow, and the chant reached a fever pitch. Real power flowed through him, a sensation akin to euphoria. This was it.

Suddenly, Liberatio yelled. “MUZAN KIBUTSUJI, AWAKEN!!”

As Liberatio's eyes glowed, Muzan felt his entire being being set alight. His nerves lit up and his blood boiled as intense sensations racked his being, leaving Muzan shouting in pain as he felt... something at work inside him.

"Just relax, let the infernal spell do its work." Liberatio said as he and Muzan sank their sharp nails into each other with their free hand. Muzan and Liberatio switched between pain and pleasure as their blood pulsed and spikes of sensations deep within them roared through their bodies, starting with the connection where their blood met and mixed inside each other.

After what seemed like an eternity, the sensations calmed down and the pentagram dimmed. They easily healed and cuts, traces of blood running down their bodies. They stood up. "It is done." Liberatio said as he went to the sink. With a spell, he filled it with water and offered a cloth to clean themselves. Muzan took the invitation as they got their cloths wet and wiped off the blood.

“So, I’m a full demon now? I have purged my old weaknesses?” Muzan asked.

“By all accounts, you should." Liberatio said as Muzan quietly glared at him. "What? This is the first time I’ve done this and demons don’t exactly do this for everyone.” After they cleaned up, the portal returned, ready to bring them back to the land of the living. Muzan went for his clothes, but Liberatio stopped him. “Oh, you can leave those behind. You won’t need them anymore.”

Muzan had a brief deadpan look as Liberatio walked towards the portal. He wouldn’t complain too much, seeing as Liberatio was also departing naked and was very pleasant on the eyes. Muzan follows Liberatio through the portal, his eyes shamelessly looking at the other male’s ass. ‘So this is your idea of hedonism.’ he thought with a brief chuckle of amusement.

They returned to the land of humans, though this time in a different location. It was a residence, though it was much more basic than Liberatio’s dwelling in hell. They were in a large room that was mostly barren, containing a bed, a table with a chair, and some minor decoration.

“Forgive me if my home in Japan isn’t as lavish as the one we left.” Liberatio said. “I usually hop from place to place during my travels and don’t have many permanent homes. Currently, we are located in the middle of the woods up in Northern Honshu. There’s a little town a few miles to the west and the ocean is just outside.”

Muzan looked out the window, seeing the ocean outside and the shadow of the roof pointing away from the door. ‘It must be early morning.’ Muzan noted. Then, he realized that this was the moment of truth. It was time to see if what he experienced with Liberatio truly perfected him. He turned to the demon, who smiled and gestured to the door.

“Go on, Muzan. Embrace your newfound gift.”

Muzan briefly hesitated. This would be among the most nerve-racking things he had done in his life. He would either be rejoicing in the sun, or be swiftly killing the demonic being for trying to deceive him for a laugh. He turned the knob and opened the door, ready to fulfill their destiny together.