AN: I'm excited to expand upon such an interesting Biblical legend.
Lux was supposed to be his paradise lost on Earth. But lately, it'd also become a hotbed for something he wasn't used to, something he wasn't sure if he liked or not: introspection. Frank, the closest thing he'd had to a real friend in eons, was now gone forever. There was a difference between regular faith and blind faith. In Lucifer's opinion, it was the latter that'd killed the preacher. A tribute poured out unbidden as his fingers danced across the piano keys: "Knocking on Heaven's Door". Behind him, he heard the soft squeak of door hinges. This was followed by the scuff of shoes on the club's floor. A hint of perfume met his nose, announcing its owner's presence, before she uttered a single word: Chloe Decker. He didn't greet her with a snarky flirtation, as he usually did. In fact, the corner of his mouth just barely twitched up in a smile as she sat beside him. She gently patted his arm twice to get his full attention. He shifted in his seat, and their eyes met.
Chloe sighed out, "Hi."
He huffed, making a groaning noise that sounded like a return "Hi".
This was followed by, "Bit late for a new case, isn't it?"
"I'm not here about a case. I'm here for you?"
He put a bit of charm into his voice: "Really?"
She knew this was a front, and a tiny barely-audible sigh escaped her.
Her tone remained soft as she replied, "Yeah. I figured you could use a friend."
To deflect the awkwardness, Lucifer gestured at the piano and asked if she played. After a bit of cajoling, they ended up playing a bouncy song called "Heart and Soul". It was soon on a loop, like they couldn't stop playing. When the conversation did pick up again, it started from a place he hadn't expected.
Chloe said, "So, I've met your brother..."
He wanted to roll his eyes, but he didn't want to ruin the moment.
He replied, "Yes, and once was quite enough."
"Well, I was going to ask if he was your only sibling. I mean, do you have other brothers or sisters?"
"Yes. In fact, I have several-too many to count, really. Now, let's move on to something else."
"Come on. It's a harmless question. I know you have a lot of trouble, talking about your family, but you promised to be honest with me."
He hated when she was right. The look on his face must've betrayed this, judging by the giggle that escaped his companion. He gave a slight chuckle of his own, while continuing to play music.
She then asked, "Was there one particular sibling you were close to? More than the others, I mean."
Instantly, his focus glazed over as his mind drifted into the flashback. He remembered that last fight, how her dark irises had blazed fiercer than Dante's vivid Inferno. He couldn't believe she'd been so blasé about this unjust fate they'd been given. She claimed to have done so just to stay close with him, but he wasn't sure. It was that same uncertainty that led to extreme mistrust, and thus to the fight that split them up. He remembered the tears in her eyes as he waved his hand and made her disappear, the very tears that were now prickling in the corners of his eyes.
His reply to Chloe's question came out in a breathy, trance-like tone: "My sister…my twin sister."
"Twins?"
Instantly, the vision cleared, and Lucifer blinked. He covered up his emotions by clearing his throat and scratching his cheek, loathing the changes he refused to admit were taking place. He again flashed his most charming Cheshire cat grin, standing up and walking over to the bar.
As he set up the drink he wanted, he said, "Yes, twins. It's quite rare for us. She and I had a bit of a spat, and we haven't spoken in many, many, many years."
His abrupt tone at the end of that sentence told Chloe he was done with the conversation. Right, as if she'd let him get away with giving her so little info.
"Tell me about her. What was she like?"
Silence. He was probably hoping that if he ignored her line of questioning long enough, she'd eventually grow tired of it and change the subject.
Said hopes were proved in vain when she then asked, "What was your big fight over?"
He slammed a bottle hard on the bar's counter, replying, "Honestly, detective, you're like a dog with a bloody bone! At some point, you're going to break your teeth!"
She raised an eyebrow, the corner of her mouth just barely twitching up. His shoulders dropped, a sigh escaping him as he realized she wasn't going to back down.
Pouring a glass of scotch, he said, "Alright. I questioned her motives for following me. I said that she used me as an excuse, like all the mortals here do. She was offended by that, as you can imagine. Things escalated beyond either of our controls. Impulsively…I punished her."
"How? What did you do?"
"I cursed her. I gave her permanent humanity, and I banished her to this world. It's the only regret I've ever had in my entire existence."
Chloe sighed, fighting the urge to roll her eyes. For the life of her, she couldn't understand why he continued to cling to this delusion. He probably yelled a few choice profanities at his sister, and she ran crying from his home and drove away. And even beyond that, she knew he had a few more recent regrets that he'd never willingly admit to. She flashed a tiny smile when he poured a second glass of scotch for her, mouthing the words "Thank you" as he slid it along the bar to her waiting hand.
She was mildly surprised when, without further provocation, he volunteered more information about his sister: "The last time I made a solid effort to track her, I learned she was also living on the west coast."
This had to be the other reason why he'd chosen to move to L.A. He was trying to find and reconcile with his sister.
"Okay. Last thing, I promise", and she paused before finishing, "What was her name?"
A noise that sounded like "luh-luh" was muffled as he took a gulp of his drink. He then cleared his throat and wiped his mouth with the back of his hand, smirking when that rude action made Chloe roll her eyes.
"Lilith", he told her, "Her name was Lilith."
AN: Next chapter, we meet her.