Work Text:
Mammon is the one to come in first, of course, he planned to grab some useful things and leave others.
The door of Lucifer’s office clicks shut behind him, and he looks around excitedly, as though someone might be hiding somewhere, or else has a secret that no one should know about. He’s got his hands full with an armful of things: bags, books, a few cans of soda and a box of donuts.
But it doesn't take long for Lucifer to notice him.
"Hello?" Lucifer asks cautiously, not expecting much to happen this morning.
When Mammon turns his head slowly to face him, he realizes that maybe he was wrong for interrupting his older brother peace, but it wasn’t like him to worry about those things.
The bag slapped against Mammon's chest when he sets it down and looks at Lucifer sheepishly.
"Hi," he said, scratching at his arm nervously.
"What are you doing here?" Lucifer asked, looking from Mammon's hands to the bag. "Are you going on another scavenger hunt?".
Mammon was ready to start explaining everything when there's a loud thump. The bag falls to the floor, spilling its contents everywhere. Lucifer stares, completely taken aback by the sudden noise. It takes a minute before Mammon speaks again.
"Uhh..." Mammon starts, then clears his throat. "Sorry."
Lucifer sighs. There goes his plans for the day. He's just starting to get back into the swing of work when Mammon comes over again. He picks up the fallen items and dumps them on Lucifer' desk.
"I'm really sorry about this," Mammon says quietly. Lucifer's about to say something when Mammon continues.
"Look, I'm really trying not to cause problems between us, so if you can just let me go with Y/N to the-"
He cuts himself off, but Lucifer doesn't miss the way he stops mid sentence. Narrowing his eyes suspiciously while staring at Mammon in a more skeptical way.
"Let you do what?" he prompts.
"Nothing!" Mammon replies quickly while feeling your footsteps getting close, that meant the plan was settled and you were ready to get out of RAD.
His eyes dart back and forth between Lucifer and the scattered papers all over the floor. Then he lets out a long exhale, and picks the bag up. He drops it back onto Lucifer's desk with a heavy thud.
"Anyway... I’m gonna go now. See ya later!"
Lucifer was about to scream at his brother when he saw you too running with Mammon, but instead tried to keep focusing, figuring he wasn't supposed to see you until later anyway.
He's been working on some important paperwork, and really didn't want to ruin it by getting distracted with you when he needed every ounce of concentration he had. But didn't expected to then see you and Mammon walking together from his window, either. You both were holding hands.
Lucifer frowned slightly. He never would have guessed you were friends, especially considering how you two always seemed to hate each other. Maybe they aren't even together he tought, but why else would Mammon run after you like that?
It was almost like a scene straight out of a sitcom; a scene you'd seen a million times before. But it shouldn't be as weird as it feels.
He knows that there's something more between you two than hatred and fighting, though he doesn't want to go deep on thinking about it.
Meanwhile you and Mammon were in the forest trying to find the best placement for the new secret tree house you wanted to build and pestered him about. It took a lot of planning, and he could tell it was too taking a lot out of you, so he decided he'd help you instead. Obviously not with innocent reasons, he figured that way it will be useful to have a place to stay apart from the House Of Lamentation where he could feel safe and have you all for himself, plus handling things with magic made the process way faster.
After that, he was happy. You were smiling so much, and he liked it. He likes your smile. He hoped to see it more often.
That's the problem; whenever you smile, he wants to smile too.
The sun is setting when you finally finish decorating the treehouse, and he can't stop smiling either. All the little details are perfect, and the treehouse is so cozy. He loves it already.
You plop down next to him in the small couch you both had put in there and looked at him expectantly.
"Well?" you ask, leaning closer. "Do you think it'll work?"
He chuckled happily.
"Of course it'll work! Look at the size of it, it's perfect!"
You blushed and laughed along with him.
"I guess you're right," you agreed. "But it does kinda look a little cramped..."
"Hey, who cares? It'll be fine!" he exclaims cheerfully. "Besides, there's enough room for at least three people here. We'll figure that out later. For now, we should enjoy"
You nodded and kept looking at his lips as he continued.
"Besides, I don't like the idea of leaving you alone in the middle of here, I worry about your safety ya know?."
Your eyes grew wide and a light pink spread on your cheeks, making Mammon grin. Before he knew what was happening, he found himself leaning forward to kiss you. Your eyes fluttered shut as he pressed his lips softly against yours.
A soft moan escaped your mouth, and he grinned, kissing you again. He heard you gasp as his hands travelled upwards, tracing your spine and pulling you closer towards him. His fingers grazed your hip bones, making your breath hitch ever so slightly.
A low groan left him as he felt your body press tightly against his, and he buried his hand in your hair. He was sure it was messy because of the wind, but you probably wouldn't care.
"Oh hell…" you whispered, pushing away to give him access to your neck.
He chuckled once again, trailing kisses over your jaw and down to your collarbone. You wrapped your arms around him, pressing yourself further into his embrace.
You felt hot, and you weren't sure whether it was because of the heat of Mammon' hands or his lips. You ran your fingers through his hair, letting out a surprised squeak when he pulled your shirt up and trailed his tongue along your skin.
His kisses trailed downwards, until he reached the edge of your pants.
"I thought you said you didn't like wearing clothes under your uniform," you teased him. "And that you liked how my underwear fits over your waistband, so why did you change?"
He looked up at you, and his face darkened.
"I thought you liked that." he growled, biting down lightly on your shoulder. Your eyes widened as he sucked hard, his hips bucking upwards slightly.
"...You liked how my underwear fits over your waistband," he repeated, his voice deeper and rougher than usual.
You moaned, arching your back slightly.
"Yes," you breathed, "I like that very much."
He smirked, and you felt his teeth graze your skin.
"Good," he murmured, licking across the spot. He paused for a moment, before continuing. He kissed a line up your stomach. "Now I gotta take these off, or else I won't be able to control myself for wanting to fuck you senseless."
"Mammon..." you groaned softly as his lips found your sex. Your head fell backwards against the pillow and his tongue circled your clitoris, sending shivers through your body. You gasped and arched your hips, urging him to hurry. You wanted him now.
"Mm", Mammon purred, "So eager for my cock."
You gripped his head, tugging gently at his hair. Mammon groaned, and slid his tongue across you, circling around your clit and teasing it mercilessly. Meanwhile he continued circling for minutes without stopping, making your breath hitch and your eyes roll back in your head.
He stopped to pull away briefly only to bite his own lip, tasting your arousal. When he was done he licked you clean, moaning loudly when he tasted your insides. You whimpered, throwing your head back when he started to now suck your nipple, his other hand massaging your core slowly, over stimulating you too much.
He used both hands to pull away from you then slide his fingers inside you, that way pumping his fingers in and out. He sucked and nibbled on your breast until you were panting and moaning loudly for him to take you. His fingers worked feverishly inside you, making your whole body shake.
You tried to get the words out of your mouth "Please Mammon, I want you inside me"
He moaned against your skin before pulling his fingers free, placing them on your entrance instead. Pushing your legs apart slightly, spreading your folds open completely.
He leaned over, resting his forehead against yours. You could barely breathe as you waited for his cock to brush against you. When he did you let out an excited cry.
"Mammon! Please!"
He moved back to his place behind you and rubbed against your entrance, causing you to grip his shoulders painfully. You bit your lower lip hard enough to draw blood, your nails digging into his skin as he pounded into you, hitting your cervix and making you scream and moan louder than ever before. He grunted in pleasure, his hips thrusting faster as he slammed into you.
You cried out in pain as he entered you again, hitting the right spots. He held onto your hips while moving, burying his face in your neck. You moaned loudly and dug your nails into his back until finally, you came with a shout as you orgasmed. His hips continued thrusting, and he moaned deeply as he released his seed into you. Then he collapsed, breathing heavily as he stared at your chest in awe.
"Wow..." he muttered, and you laughed breathlessly.
"Yeah" you agreed, turning your gaze to him. You smiled, and leaned up to kiss once, twice, three times, before you lay down next to him. He turned to you, pressing a lingering kiss against your forehead.
He knew this moment would end soon. But maybe it wouldn't matter. Not if he got to spend the rest of eternity with you.