Forgive me for this but I can't stop imagining a game night with all the brothers where most of them are at least tipsy, and maybe you are too and there's nothing wrong with being touchy right? Playing truth or dare or sitting in someone's lap, or Asmo's arms going around your waist while he whispers sweet little things in your ear because he knocked back too many fruity cocktails. And maybe you're not lucid enough to notice but Mammon is off to the side absolutely seething, glaring at the hands on your knee, thigh, stomach, the arm around your shoulders, the kisses on your cheeks, the way you're smiling but not at him- he can't stand it. He's already tried to pull you away, keep you to himself without actually saying that's what he's doing, but his brothers always manage to drag you off and he knows it's intentional.
So it's really not his fault that he follows you when you go to get another drink. He stalks you all the way to the kitchen and rests his chin on your shoulder, takes the glass out of your hand before wrestling you into the pantry, covering your mouth as he locks the door. Your eyes are so wide in the darkness and your body is tense, you can't see like he can and his hands are so strong when they push you against the wall, wrists behind your back. He can't help that his cock twitches when he presses himself against you and hears your terrified little breaths, the bones in your arms creaking from the strength of his grip. You're just too pretty, he tells you between hurried kisses to your bare neck, tongue darting out to taste your skin. It's only his fair share.
I want Mammon.... I need to feel what it's like when you climb into his lap with no hesitation, right in the living room while he's mindlessly scrolling on his phone. The way he stiffens up and asks you what you think you're doing, but his arms are already gripping your waist and pulling you closer. How he relaxes completely when you rest your head on his shoulder and melt into him, resting your eyes, letting him press his head against yours and feel your heartbeat in his chest as you fall into a comfortable half-sleep. Ignoring the wolf whistling and teasing from his brothers because he wouldn't trade this for all the Grimm in the world, and he's not going to snap at them and risk waking you up. How he gets sleepy as time goes on and everyone else goes to sleep, as Lucifer retreats to his study and all the lights turn off. The perfect opportunity to kiss him, finally let yourself go after so much time spent pressed against him, finally grind against his thighs and coax his cock to full hardness as he groans under you. Riding him with your clothes pushed aside just enough to let him fuck you, grinding yourself on his lap and tugging on his hair when you kiss, telling him how gorgeous he is and how much you love him. Sinking down onto his knot right as he cums, your fingers in his mouth to muffle his moan, his hands grabbing your hips and nails sunk deep into the fat of your ass to keep you full of his cock as he breeds you. Cumming with a sweet little whine against his neck and feeling his softening cock throb inside you. Finally satisfied enough to wrap your arms around him and fall asleep.
Oh to suck Mammon off... He's all cocky until you actually do push him against the wall and get on your knees, then he's all blushing and stammering. He puts his hands out as if to stop you but there's no strength behind them, you easily guide them into your hair while you lean closer, fumbling with his belt in your excitement. You can already see his boner, feel the heat of his skin radiating through the distractingly tight jeans he always wears. Giving his cock a squeeze through his boxers to marvel at the thickness and watch it jump, staining the fabric with a bead of precum. It takes nothing to rile him up when you're the one doing it, Mammon is already whining at your touch, hips twitching, legs tense and shaking on either side of your head. His stomach flexes when you press a feather light kiss to his clothed cock, your fingers dancing along his thighs and tugging at his waistband, looking at him in a silent plea. Mammon folds instantly, moaning out a pathetic little "please" and slapping a hand over his eyes, knowing that if he so much as looked at you now his legs would give out.
You can't help but moan when you finally pull his boxers down and free his thick, pretty cock. You kiss the underside once, twice, working your way up to the tip before talking it in your mouth. This is as much for your pleasure as it is his, and Mammon is unknowingly putting on a fantastic show with his head thrown back and his warm skin flushed an even darker shade than usual. You run your hands and tongue up and down his length, tracing the veins on his shaft with open mouthed kisses, licking the small hint of hair on his stomach before capturing him in your mouth again.
There's nothing quite like letting his cock rest on your face, smeared with cum and drool, and looking up at his desperate, debauched, almost fucked out face. Every kiss and suck gets a response out of him, his hands tightening in your hair or his hips twitching, his cock leaking thick, pearly strings that you're all too happy to lap up. The sight of his cockhead tapping against your cheeks or his precum tainting your mouth never fails to send Mammon into a frenzy, and you love to take advantage of it.
His hips rut into your mouth, hand cupping the back of your head to keep you still as he desperately chases his high, so overwhelmed he's nearly in tears. He'll ever get used to having you like this, to feeling your tight throat around his dick and your eager hands squeezing his thighs and ass because you actually enjoy this, you want him. He pulls out just in time for a powerful orgasm to wrack his whole body, thick ropes of cum painting your face, marking you, claiming you. Your eager, clever hands stroking him the whole time, squeezing lightly to milk him dry.
Offhandedly telling Mammon you love him and he stares at you very intently telling you to repeat yourself so you do and he demands it again, again, drawing closer every time, grabbing your hips to pull you into his lap, guiding your hands under his shirt and across his chest, whining into your mouth that he loves you too...
Yes ofc sorry for the delay! Have some thoughts in relative order (and again please check out this fic)
Lucifer: To me Lucifer has the picture perfect dick. YA novel male love interest dick. 6 inches long and thick enough that he has to finger you open for a bit before going in, and you can see how much he likes it. Always has an annoying little smirk on his face when he makes you cum around his long, slender fingers. He's prone to degrading you during sex but honestly that's to be expected, fucking you feeds his ego like nothing else. He's not a fan of showing you off or public sex in general though (that's Diavolo's thing), likes to keep you to himself instead.
Soft sex is possible but he has to be feeling mushy beforehand, like from a date. Lucifer usually prefers to take his frustrations out on you during the act and saves the gentleness for later, when he runs you a hot bath and washes your back.
In his demon form not much changes, except he's proportionately bigger and meaner. His cock grows stiff, fleshy ridges along the underside and he loves the noises you make when he fucks you from behind and they rub against your insides. The biggest differences are him biting you all over and fanning out his wings to cover you both, simultaneously shielding you from the outside and preventing your escape. Grab his horns for support, he loves it.
Mammon: My sweet Mammon, my perfect boy. His cock is short but abnormally thick, to the point where penetration is almost not worth the hassle. He distracts you from it though, always kissing you and groping you while he humps his cock against you until he finally nudges inside. He always whines so prettily when you squeeze around him, it's so obvious he's in love with you. Mammon fucks hard and fast, desperately chasing his next orgasm while simultaneously trying to wring one out of you. He'll do and say anything practically anything to get you off, just please let him hold you close and finish inside you.
In demon form he's always half hard, ready for you to drag off to a secluded corner for a quick fuck. You can rile him up anytime but it gets ridiculous when his horns and wings come out. His cockhead grows pointed and a fat knot appears at the base of his already thick cock. He gets touchier than usual and purrs, or messes with your hair/clothes as a way to preen you. Imo he frequently proposes cockwarming bc he wants closeness, but always ends up getting needy and fucking you.
Leviathan: Well it's been said before but Levi has two cocks, period. The one on the top functions as a human's would and the bottom one is reserved for laying eggs. They'd both look fairly weird, I see them in my mind as those alien themed dildoes with strange shapes. They're always slightly cold and produce copious amounts of clear slick instead of normal precum. In his demon form I'm not sure what would change... his skin would be coloured differently, maybe blueish-grey or scaly. His ovipositor probably bulges and becomes more noticeable, as opposed to his human form where it's not that visible.
Being really tired but you and Mammon just can't keep your hands to yourselves, he's so desperate but so sleepy and so are you, tumbling onto his bed, kissing sloppily, and straight up humping and grinding against each other... sigh dreamily...
WAILS.....oh this is so hot..... Imagine spending a lazy morning like that because everyone else is out of the house or locked in their rooms, staying warm under the blankets in Mammon's bed while you kiss him and run your hands over his bare skin.... He gets so impatient to feel you and strips off any clothes you might have worn to bed before tangling your legs together, grinding the underside of his cock against your tummy and squeezing your ass, whimpering when you suck on his nipples and lick his neck, mumbling about how pretty you are and how lucky he is to have you... Just slow, sloppy grinding as you both get wet and desperate
What about.... You set up a movie night with Mammon, hide plenty of snacks where nobody will find them, make sure nobody is going to need you for the night, everything is perfect. But all the others won't let you go! Jeering when you try to drag Mammon off, Asmo won't stop loudly wondering if you aren't trying to get him all to yourself so you can do... other, less innocent things. Tired and annoyed you say that yes, we're very much going to fuck, and slam the door behind you.
The two of you settle down in silence, Mammon leaning against your headboard with you sitting between his legs, your laptop already open and ready. He's got his hands around your waist already, like he always does when you sit with him, he needs to have as much physical contact as possible.
"Were ya' serious about havin'... 'bout fuckin'?" He asks almost casually.
You snort, not even bothering to turn around. "Nah, of course not. I just thought they might leave us alone for longer."
He immediately deflates, forcing out an awkward little laugh, not holding you as closely anymore. The realisation sinks in and you turn around in his arms, half grinning already.