The portal to purgatory from the demon realm wasn't far, but you and Meliodas were technically traitors so you had to be quick about it. The demon realm actually hadn't changed much in the last three millennia, the three of you noticed. You reached the portal without any issues, peering into it. "We should hold onto each other so we don't get separated," you suggested. Rather than hold hands like you were thinking, they smashed you in between them, hugging tightly before jumping in. You giggled at their silliness, they were so different but very much alike.
You arrived in purgatory, the Lilith sandwich still intact. The eerie landscape and monsters weren't intimidating to you, it felt nostalgic considering the Demon King sent you three here to train some days. "The Triad of Death has returned home," the Demon King announced, "Have you come to pledge your allegiance to me? I saw the way those lowly beings you called friends looked at you as if you were monsters." His presence had always made you uncomfortable, but you had Meliodas and Zeldris by your side right now. "How intriguing. So I was right, the daughter of Keir and Layla possesses the ability to transfer and amplify power to another," he chuckled sinisterly. "What are you talking about, father?" Zeldris questioned him.
"I'm surprised you hadn't figured it out in all these years. Keir and Layla's daughter possessed the Light God Slayer ability yes, but that wasn't the only reason I chose for her to grow up with you two," the Demon King explained, "You were named the Triad of Death because I planned that you two would sleep with her. I didn't think it'd take this long for my plan to come to fruition though." You felt Meliodas and Zeldris tense. "Though, I didn't foresee you fucking her at the same time, this may be why you all have dramatically increased power now. You'll be unstoppable."
You all went into Assault Mode, not only did he strip you away from your family and turn you into a war machine, he brought you to his home for his sons to have their way with you. You love that the Demon Princes have their way with you but that the Demon King planned it was fucked up. "The goddess clan has resurrected the other two Archangels just now. They want nothing but to destroy you, your lover, and your clan. You are preparing to fight the wrong being," the Demon King chastised you, "They'll view you as nothing but monsters but here you'd be revered."
Meliodas started forming balls of compressed dark magic, Zeldris grabbed his sword and imbued it with Hellblaze, and you activated your Devil Slayer magic. "You three need to learn your place," the Demon King roared, slashing his gigantic sword at you. You ran up his right arm, Zeldris ran up his left, and Meliodas went straight down the middle. You heard Meliodas yell, "Trillion Dark" as he launched a seemingly infinite number of tiny concentrated dark magic balls at his father. Zeldris yelled as he brought his sword down on one of his father's horns, slicing it off. "Devil's Rage!" you yelled, dark magic pouring out of your hands into the Demon King's eyes.
"Lilith isn't some tool to be used to get stronger!" Zeldris argued with the Demon King. Meliodas chimes in, "She's much more to us than that!" You three continue your barrage of attacks, all of them seeming to be effective. "I love her!" the brothers yell in unison. "You don't have the capacity for love, your minds have just been warped by her!" the Demon King roared. They had had enough of their father talking shit about their lover. Meliodas pulled out Lostvayne, he and his brother then flew at their father striking hard down the middle yelling, "Tyrant Killing!" You started focusing your Devil Slayer magic, 'Guys, I have a plan to ensure we can destroy the curses and Commandments,' you spoke to them in your mind.
'What's that?' you heard Zeldris in your head, 'Helpful, we can communicate telepathically now,' Meliodas voice rang in. 'Great I have to hear your's in my head too?' Zeldris commented in an exasperated tone. 'No bickering, we're busy. I'm going to absorb the Demon King's power by using Dark Liberator. With your Devil Slayer magic I shared, you'll be immune. After I absorb it, well you know what to do,' you instructed. You heard both of them chuckle in your head before they landed another hit on the Demon King, knocking him off balance and creating the perfect opportunity for you to launch your attack.
"Dark Liberator!" you yelled, trying to make it as strong as possible, knowing it was going to take a huge toll on you by using this much energy. You were about to gain a shit ton more by comparison and you weren't sure you could handle it but you had to try. It took a bit, but the Demon King's body started to be converted into dark magic. "Don't do this! You'll upset the balance of power," the Demon King started to beg for mercy, but he had you three raised to be ruthless and in Assault Mode you were at peak ruthlessness. "We'll deal with it if it comes to that," Meliodas looked down at him. "Now die," Zeldris added.
All of the magical energy rushed into you, causing you to fall from the air. Zeldris caught you bridal style. You were still conscious but it was a shit ton of energy and your body wasn't prepared for it all at once. He landed on the ground and laid you down before positioning himself above you. He kissed you passionately, but knowing he had no time to waste, you felt him thrust inside you. It'd been a while since you were with only him, and it was nice, just the two of you. He used his thumb to rub your clit as he thrusted steadily, he knew exactly how to get you off quickly. "Cum for me, baby," Zeldris demanded, sending you over the edge. Your back arched and you moaned with the release of pleasure, feeling Zel finish inside you as well.
You weren't finished though, you felt Meliodas grab you from behind after Zeldris rolled to the side letting his body adjust to the power you just shared with him. Meliodas picked you up and you wrapped your legs around his waist, feeling his dick inside you as well. You held onto him with your arms around his neck and he dug his fingers into your hips. He was always rougher than his brother, it was the best of both worlds. He licked and nibbled your neck, before moving to your ear and whispering gruffly, "Be a good girl and moan louder for Daddy." You instantly obeyed, but the moans were soon stifled when Meliodas put his tongue in your mouth, kissing you deeply. His tongue dominated yours, and you moaned into his mouth. You were already so sensitive from sex with Zeldris that you didn't take long to cum for Meliodas. With a few more thrusts, you felt his warm cum inside you. He laid you down before collapsing next to you, the three of you needed to rest and let your bodies adjust.
"We shouldn't stay here," Meliodas piped up, "I don't need to tell you both what'll happen if we all lose consciousness here." You and Zel looked at him and nodded. Thankfully, the fight with the Demon King was right next to the portal back to the demon realm. They thought they'd be funny and smashed you in between their chests again before jumping into the portal. It was night in the demon realm now, you were unsure of how long your fight with the Demon King lasted. The three of you sat next to each other on the ground, staring at the pitch black sky with two small moons. It was a familiar sight from your younger days, and you knew you'd be seeing it again soon.
After you rested and seemed to be okay with the new power raging inside each of you, you headed back to the cave leading to Earth. It was a quick trip and you soon arrived in the cavern at the bottom of the cave. "I wonder how long we'll be able to stay on Earth with this much power," you pondered out loud. "Not long if I had to guess, we were already pushing it before we left at 185,000 each," Zeldris responded. You nodded sadly, seeing your friends' faces after you attacked them would be the last you see of them. Zeldris and Meliodas each grabbed one of your hands as you made your way up to Earth. Once you went through the portal, you breathed in the miasma free air, it tasted and smelled so much different, you were savoring it.
The three of you ran to where you left Elizabeth, she was sleeping and looked so peaceful. Meliodas looks at the two of you, which you nod in response. With the power the three of you had between you, you summoned the visual representations of the three curses. Then, you sent enough of your magic to destroy them, erasing them from existence. "Now the Commandments," Meliodas suggested. He and Zeldris chanted, five commandments coming out of each of their palms. They set them on the ground and the three of you focused your magic on destroying them. This took a lot more effort, you were destroying the remaining power of the Demon King but you accomplished it.
All of you breathed a sigh of immense relief then grinned at one another. You were free from the Demon King's tyranny for the first time in your lives. You went to Elizabeth's cage and dropped the magic which dissipated instantly. You gently shook her away, "Ellie?" She opened her eyes and saw your hazel ones looking at her. Then she saw the two pairs of green eyes of the brothers. "We did it Elizabeth. The curses are gone," Meliodas smiled at her. Elizabeth looked at you wide eyed, "Really?!" You nodded in confirmation as you helped her to her feet. She grabbed all three of you into a tight hug, tears streaming down her cheeks. "I can never thank you enough, Meliodas, Lil, and Zeldris," she spoke after pulling away. "It's the least we could do before leaving," you replied. She gave you a look of confusion before Meliodas explained, "Our power is too much for this world, we have to return to the demon realm." She looked at you, then Zeldris. Zeldris nodded letting her know Meliodas spoke the truth.
Now tears of sadness were falling from her eyes. "Is there anything we can do?" Elizabeth asked. "Live your lives happily, and don't mourn us. We won't be dead, just back home," you urged quietly. "We defeated the Demon King, so we don't have to worry about him anymore," Meliodas added. She nodded, wiping her tears away. "I won't let anyone tarnish your names, you three are saviors," she declared, determination in her voice.
--At the destroyed tavern--
"What in the hell is that?!" Ban yelled to everyone, they all had felt an extremely massive power level return to where yours had disappeared for a few hours. "Not that we can do anything about it with this level of power, but we should at least see for ourselves," Merlin commented.
They took off in the direction of the immense and terrifying power.