This came to me when I was re-watching season 4. Hypothetically takes place sometime in season 5.

Lucifer Morningstar sat at his piano in his room, playing and thinking about his current circumstances. His newest escape from the Pit had been costly, complicated, and...confusing. Waves of his and his detective's recent decisions are sure to ripple through the lives of himself and everyone he knows. It is for that reason why he is very annoyed that someone is walking from his elevator into his apartment. "Look, I'm sorry to be so rude, but if its at all possible could you just piss off right...!" Lucifer falls silent when he sees who has just stepped into his home.

The man looks a bit like if Arnold Schwarzenegger was born in the Middle East. He is dressed in a flannel shirt, a pair of jeans, and some work boots, and he causally steps forward and says in an almost amused tone, "Hello, Samael."

Looking at him again, Lucifer can actually see more than a bit of Marcus Pierce. "Hello, Adam. I go by Lucifer Morningstar now," the fallen angel tells him.

"You're called 'Morningstar, Morningstar'?" the first human asks.

The Devil sighs. "...Lucifer will do," he tells his unexpected guess. "I assume you've darkened my doorway in search of your wife?"

"Death did us part," Adam answers. "She's now my late wife, and her new life is not bound to me. Eve is not why I'm here."

"Huh. You're smarter than I would think a man made of mud would be," the angel remarks.

"Clay," Adam corrects.

"Whatever. So, if you aren't after Eve, what are you doing here?" the Devil asks.

"I'm after what everyone who comes to you is after," Adam tells him.

"Rocking sex?" Lucifer asks, confused.

"What...many people, who don't want to have sex with you, come to you for," the first mortal clarifies. Lucifer looks at him with total confusion for a moment, before Adam finally and patiently says, "I want to ask you for a favor."

Lucifer begins to laugh out loud at the very thought of it. "You want a favor from me? Dad's favorite pet Frankenstein monster?! God's most beloved project?! I have to know, why on Earth would you want to make a deal with the Devil?" he asks.

"I need your help to get to Hell," Adam answers, not at all riled up despite Lucifer's best attempts.

"Why? That much time in Heaven and now you want to find out how the other half...well lives probably isn't the right word, but you get my point?" Lucifer asks.

"I have two sons who are stuck down there. I want to save them," Adam tells him.

"What for? They get to walk around in some poor dead souls body for a couple of years, and then they get to die and go right back in the Pit again?" he asks.

Adam smiles and then takes a deep breath, steadies himself and begins to explain. "I've spoken to your friend Charlotte Richards. Turns out she remembers some of what happened when your mother was possessing her, including when she saved you from your own personal room in Hell. I think I could do the same for my sons," Adam tells him.

"Thats all well and good, but once again that wouldn't necessarily give them a ticket to the Silver City," Lucifer reminds him.

"I know, but I'm prepared for that," Adam answers, steaming ahead despite the angel's interruption. "I have an incantation that can...well to put it simply purify their soul and allow for them to be reincarnated and reborn as children...babies again. To different mothers, maybe as girls, but pure and without sin once again. There for Hell would have no claim over them, and they would have a fresh start."

"Incantation?" Lucifer asks.

"...what?" the Progenitor of Humanity asks, caught off guard.

"You have an 'Incantation'? Since when can you cast incantations? When did you get magical powers?" the Morningstar asks.

"Since the Sefer Raziel HaMalach," Adam answers.

"The what?" he continues.

"The book full of true secret knowledge about the universe, given to me by an angel after we were exiled from Eden," the mortal explains.

"Which one of my brothers gave you a book full of magic?!" Lucifer demands.

"...Raziel," he answers, as if its the most obvious thing in the world.

"Okay...now that you mention it, that makes sense," Lucifer admits.

"I think you're losing focus here, Lucifer," Adam tells him.

"Alright whatever, it won't work," the angel says. "No one knows Hell like the Devil, and I am telling you that no matter how much sorcery you may know, Hell won't let your boys go without something big in return."

"I know," the clay forged man explains. "I have it covered."

"I'm curious, what do you have to sacrifice to Hell?" Lucifer asks. "Wheat, sheep, gold none of that is gonna cut it. What you need for your little scheme is a soul, the purer the better. You get it?"

Adam is silent for a moment, then he tells the Devil, "I'm giving Hell me. I'm taking their place," he explains.

Lucifer takes a step back and looks the man up and down, trying to understand him. "Why would you do that? You know whats waiting for you, what the demons think of my father, your creator. Why would you sentence yourself to an eternity of that, when you can have Heaven?" the Morningstar asks.

Adam smiles sadly. "If you ever have children, you may understand. I can't explain it to you. But that, Samael, is what I truly desire," he tells the Devil.

Lucifer is silent a second. Then he smiles his wicked grin. "Okay, that explains what you want from me, but that leaves the question...what do I want from you?" Lucifer explains.

"What do you want?" Adam asks, simply.

"Well thats the thing, I don't know yet," the angel explains, "and given the help you want from me it would probably be better if I'd gotten whatever it is from you before I fulfill your request."

"How long?" he asks.

"Day, two, a week tops," Lucifer tells him. "Now I'm guessing that you don't have a place to stay, so why don't I ring a friend of mine and get a sweet at one of the...lets go with two star hotels around here to set up a room for you. I'll call a car, it should be here by the time you walk out of my club."

"Please, don't take too long," Adam asks, before turning around and walking into the elevator.

Once he was gone, Lucifer return to his piano, hits a few random keys, and gives a one word response to this new situation that just barged its way into his life. "Shit."

Eve had just walked into the Lux and danced her way up to the bar to order an apple flavored drink when she almost screams out in surprise when she sees her ex husband walks past her. Instead she gets up, runs behind him and shouts his name right before he reaches the door. "Adam!"

The first man sighs, deeply. He had hoped that he wouldn't have to have this conversation. "Hello, Eve," he says, turning around.

"What...what are you doing here?" she asks.

"I just came to ask Samael something," her ex husband answers.

"He goes by Lucifer now," Eve says matter of factually, with her arms crossed over her chest.

"Right, I...keep forgetting that," Adam tells her.

"Yeah? Well you should also know that I'm not with Lucifer anymore, and even if I was..." Eve begins.

"I'm not here for you, Eve," he interrupts her.

"You're...not?" she asks, confused.

"Yeah, no. I'm sorry, but I have to go..." Adam is interrupted by the blade of a curved Hell-forged dagger pressed against his throat.

"Well if are trying to say that you didn't come down here for my little sexpot Eve," Maze says, holding the knife to Adam's neck, "then I'd really like to know what you're doing down here."

"Mazikeen," Adam acknowledges her...right before he forcefully grabs her by the throat and lifts her off her feet and holds her there in the air. In her shock the demon drops her weapon and now fruitfully tries to pry his vice like grip open. "You know, even with only half a face, you really do resemble her. Your mother," he tells her.

"Adam, please," Even says, trying to calm the situation. He ignores her.

"You know Lilith was a lot like you, she loved knives too," he explains to the demon, who is still struggling in his grasp. "She ever tell you what she did to get kicked out of Eden? The whole story about being on top is ridiculous, the two of us didn't have much else to do back then, so we did each other in every combination we could think of. That was a lot of fun. But then one day I wake up and I find myself tied to a couple of trees, immobile, and then she showed me the two knives that she was so proud of. She had a lot of fun that day, me not so much. The marriage quickly fell apart after that."

"Adam, baby..." Eve tries again.

"Now Mazikeen, I've been dead a long time, but no amount of time is enough for me to allow a demon to get away with threatening me. Especially one of the stinking Lilim!" he tells her. "Do you understand me?" Maze looks right at him, then blink both eyes twice. Accepting that as an answer, Adam finally lets her go. She lands on her feet for a second, then collapses to the ground, rubbing her neck and coughing as she does.

Adam turns and is about to walk out of Lux when Eve stops him. "You never told me that," Eve accuses.

"What?" Adam asks, turning to look at her.

"Lilith," Eve answers. "I lived with you as your wife for centuries, and you never told me that! I never heard you say a single bad thing about Lilith the whole time we were together, always reminiscing about her, about how much better she was then me! Why?"

"Because there was no one else," Adam tells her. "I only ever was with her and you, so there was no one else to compare you to every single time you compared me to him."

"Him?" Eve asks then she realizes. "Lucifer."

"Who else? The one you were with before me," Adam explains. "The one you could never help but compare me to. The man...angel who was so much better than me. Didn't matter how hard I tried. I could make love to you five times in a day, but that doesn't compare to the ten times old Samael could do. The one who was always bigger, longer, more handsome, and just overall...better than I was."

"Adam...Adam I'm..." Eve stammers.

"Eve," he interrupts her. "I tried my whole life to make you happy...and I never could. If you're happy here, I'm happy for you. You gave me thirty-seven beautiful children, they were my world, and I will always love you for that, but to tell you the truth: I was happy when we were finally apart, and I was really hoping I wasn't going to run into you again when I came down here." With that the father of mankind turns and finally leaves.

Mazikeen finally makes it back to her feet and stands next to her lover. "He just...caught me off guard," she explains in a hoarse voice.

"We should probably talk to Lucifer," Eve tells her.

"Good idea," Maze croaks out, before they both head for the elevator.

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