I can't get the thought out of my head so here is my thoughts on how I think the OM brothers would respond to MC asking to have kids/breed with them.
---------------------------------
• The moment you mention it, he looks at you like you're insane.
• It's not that he doesn't understand, he's wanted you the second you got too close to him.
• The look in your eyes, the scent of your pheromones as they become stronger the more he looks at you.
• His eyes lock on your torso, specifically your stomach and his posture softens.
• "Are you sure you can handle that?"
• He needs to know it's not impulsuve.
• You've mentioned how much you love kids before but you've got a lot coming if he's doing this.
• It's not only breeding, but the pregnancy would likely be grueling with a cambion child.
• Once he gets confirmation he eases into you with a deep kiss, his hand trailing your waistline and stomach as he pushes you down on the bed.
• It takes him almost no time to get undressed with smooth, elegant movements.
• His hands are constantly trailing your skin as he sets the moment, light touches to your arms, squeezing at your breasts, brushing over your hips, and slipping his fingers between your sex.
• The thoughts of your body changing to adapt fill his head and turn him on more as he begins to get impatient.
• He wants everything in his head to be true and when he finally pushes his cock into you it feels so, so good.
• He manages to keeps a solid pace despite his mind feeling fuzzy.
• As he gets closer to climax, instincts overwhelm his attempt to hold back and his demon form slips.
• He doesn't want to hurt you but he's pounding into you, harshly bottoming out, pushing in deep, with his nails dug into your hips and thighs.
• When he finally releases, his wings span out behind him and he grips you tighly against his hips.
• After a moment you start to move but he tugs you threateningly against him with a low growl.
• You aren't allowed to move off of his member until he knows your body's taken to his seed.
• He's completely thrown off guard when you ask him what he thinks about having a kid, even more so when he sees the longing look in your eyes.
• "Er, well, did ya want a kid?"
• When you give a little nod his face turns red with blush as it clicks that you were asking because you wanted to have a kid with him.
• He shifts and stares at you but you don't move away, if anything moving closer.
• Another nod and his blush deepens.
• His demon form has already slipped along with a growing erection.
• He started to take in the details of your body, your scent, and your face.
• He wanted you but it was so much better that you wanted him.
• Normally he'd be shy when you wanted to fuck but this time he was on you in no time, desperately tearing your clothes from you to reveal warm skin.
• He whimpers, jacking himself off with his face in your chest, jutting into his hand before just as suddenly slamming into your entrance.
• He grasps your upper arms when you jolt but holds onto your thighs to pound harshly into you.
• He's full of noise, groaning and moaning, panting into your ear and whispering sweet nothings and promises.
• His wings are beautifully displayed, flapping occasionally with his movement.
• His lips trail the entirety of your body and he drags the smooth surfaces of his horns along your collarbones.
• He doesn't stop until he's cum and pulls you onto his lap.
• He doesn't want any of his seed to escape so he holds you tightly with your legs wrapped around his waist.
• His face is in your hair as he breathes you in and when he leans back his eyes are shining with pride.
• Your stomach is met with light touches from his fingertips as he beams at the thought of fathering your children.
• He's ready to hide immediately when you mention it, and he does, grabbing the nearest pillow to shove both into his lap and to hide his face in.
• His demon form is immediately out and his tail lashes awkwardly as he tries to figure out what to do with it.
• It's silent for a moment but all he needs is a little push.
• "I want to breed with you, Levi."
• His shoulders go rigid and his breath catches in his throat with a shudder.
• He peeks up from the pillow to look over at you sitting there innocently as if you hadn't just awoken every urge within his being.
• His eyes glow as he glares you down and he's on you in an instant, using both his hands and tail to undress you.
• He pulls you into a kiss, happy that you open your mouth for him to stick his forked tongue to explore the surfaces of your cheeks, teeth, and tongue.
• His tail quickly finds it's way to your entrance and pushes inside deep into your cavern.
• He's even more pleased when he's met with you moaning into his mouth, sending shivers down his spine.
• He thrusts in and out of you with his tail and begins to pump both of his erections despite being so excited already.
• All he wants to do is fill you up completely right now.
• He whines for you to tell him what you feel for him, he wants to hear how much you want it, how much you want him.
• When you comply, it sends him over the moon.
• He soon pushes eggs into you, immediately exchanging his tail for one of his members, the other gliding over your clitoris and stomach.
• He's obsessed with your curves, your breasts, and the slight buldge in your stomach already as he fucks you.
• All that's left is to fertilize the eggs and you've been so easy.
• Your body wanted him just as much as he wanted you.
• When he climaxes, he clings to you, wrapping all of his limbs, including his tail, around you to hold you close protectively, playing with your hair and trailing over your back, adoring when you shiver into him.
• A mention of pregnancy/breeding is the only thing in the past 15 minutes thats gotten him to look up from his book.
• He looks at you with a cocked eyebrow and slowly closes the book, shifting to look at you better.
• Of course you were serious, he could smell it on you and had just realized that you put more effort into yourself today.
• You lean closer and he eyes you carefully.
• You looked so pretty today and added onto your usual scent, you were wearing perfume and had washed your hair only a couple hours ago or so.
• Alright, you were serious, he could handle this.
• He pulls you up by your shirt and backs you against the wall to kiss you, dropping your bottoms and underwear.
• He touches you gently but quickly works you up, finding every sensitive spot and targeting it with a certain harshness.
• The smell of your pheromones is starting to drive him mad.
• He rips off the rest of your clothing and moves you to the bed, stripping himself.
• Almost immediately he's over you, whispering into your ear, smirking as you squirm under his touch.
• When he begins to pump himself, he growls quietly, making promises to fill your womb, to impregnate you, to make you beg and scream.
• He only gets more riled up when he can sense the fear and the stronger arousal wafting from you.
• He enters you roughly and holds out for a bit but the moment your pussy clenches around him with a deep throb, he caves into his demon form.
• His tail lashes behind him and he digs his nails into you as he bottoms out with every thrust.
• He needs a good grip on you and there was no way you were going to move in any way that didn't help him.
• His nails drag along your skin and his teeth sink into your shoulder.
• He's not afraid to draw blood as long as the job gets done.
• He sighs deeply after climaxing hard against your cervix and pulls you into his chest.
• He's very gentle again, rubbing your back and kissing your head, praising you.
• He's already apologizing softly and planning on what to grab to treat your wounds.
• He has been waiting for this moment the entire time and he'd be lying if he hadn't fantasized about knocking you up.
• It was fun to have casual sex and be intimate with you but the thought of actually getting you pregnant was another thought that even he knew wasn't something to ask you about.
• Having you finally mention it is music to his ears.
• "I thought you'd never ask, Darling."
• He's over you in an instant and he's humming contently as his pulls your arms above your head, slipping your shirt off, tugging your bra free.
• He kisses your breasts, sucking and biting your nipples, letting out giggles as you shift and whine under him.
• He lets go of your wrists only to bind them to the headboard, moving downward to kiss at your waistline as he finishes undressing you.
• He leans back to take it all in, the beauty of you on his bed.
• It isn't a new sight but it felt different this time, there were no consequences for whatever you two were about to do.
• He undresses himself, allowing his demon form to slip through, his small wings stretching out and flapping slightly.
• He arches his back, on his knees and jerks off over you, flaunting himself.
• His chest swells as he gazes at your beautiful body and can watch the look on your face as you watch him stroke himself.
• When he's ready, he spreads your legs and pulls them over his shoulders.
• As he enters, he folds you over, thrusting deep into you.
• He knows all of your sweet spots, pounding against them and using his hands and lips to graze over others around your body.
• He lets you take a small breather when you cum before him but soon wraps his arms under the small of your back, pulling you close to him as he peaks himself.
• He keeps you held with your waist up, not wanting anything to be able to leak out.
• If he was going to do this, he was going to do it right.
• He does want to take a bath with you once he's sure you've taken up his seed.
• He's a little confused as to where such a big question came so randomly.
• Maybe you were in heat yourself?
• You had mentioned in the past that you were interested in having kids but this time you'd specifically stated with him.
• He can't help but be concerned.
• He doesn't want you to regret anything in the future based off of hasty decisions that can happen during heat, he would know.
• "Are you sure you want to breed with me? I don't want to hurt you."
• Of course he was scared to hurt you, that's the thing he wanted least.
• He's so big, and you're so small...
• He couldn't even think much of how anything past the sex could be problematic.
• When you give him gentle confirmation, he slowly moves closer and cups your face before kissing you.
• He's slow and soft in his movements as he pulls you closer and helps you undress.
• He breathes heavily into your neck, panting as his hips grind against your thigh, his demon form emerging.
• He gropes your breasts, his hands large enough to envelope the soft, tender skin.
• He whimpers and whines, eagerly pulling his clothes off when you run your hand through his hair encouragingly.
• He lifts your legs a bit and lowers himself to nuzzle his face into your sex.
• His tongue explores over the surface and he sucks on your clitoris.
• He chuckles happily when you moan and arch back, grinding your hips against his face.
• He laps at your precum, savoring all of the flavors before pausing at the twitch of his own sex.
• He pants quietly and undresses himself, grasping his member in his hand.
• He eyes you again, feeling overwhelmed but still pausing nervously.
• It's easy to see his concern so with soft affirmation that you'll be okay, he proceeds and pushes into you.
• He's not wrong to be worried, he's massive.
• Surprisingly, he slips into you with little difficulty, bottoming out with a satisfactory sigh.
• He sets up a pace, increasing speed as he goes.
• As he takes in all of your features, he focuses on your stomach and squeezes your sides and hips lovingly.
• The way you arch your back and the way his member protrudes at your waist and lower stomach makes his stomach wobble with butterflies.
• He gets more aggressive as he nears climax, slamming his hips against yours until you feel him jut, his seed spilling out deep inside you.
• He's got you enveloped in his arms, clutching onto your shoulders, apologizing if he hurt you between pants.
• With a couple pets to his head, he relaxes again, protecting you while his seed takes.
• He can't help but wake up a bit more when the word 'breed' slips from your lips.
• You wanted to breed with him? Were you insane?
• "What would possibly make you want to breed with me?"
• Not that he was complaining, just genuinely surprised that you'd actually ask.
• He's thought of it a couple times but managed to shut down the thoughts or at least contain them with masturbation.
• You wanted it though, wanted him to take you over, and he wasn't going to say anything against it.
• He's on you with a hand over your throat, a smile starting on his face.
• The scent mixture of arousal and fear nearly made him shudder himself.
• He gently pulls your bottoms off, shoving your shirt up to your neck.
• He presses his face into your breasts, sighing deeply as he starts to finger you, slipping one by one into your pussy to stretch you out.
• He lets his demon form out, his horns replacing his hand, threatening to prod your neck.
• His free hand travels down your side to your hip.
• He pulls his fingers out of you and plays with the slick before pumping himself, letting your fluids coating him.
• His tail flicks behind him contently as he gives a small shudder.
• He shuffles forward and lifts his head from your chest to angle into you, thrusting his full length up harshly.
• He chuckles quietly at your gasp and thrusts aggressively to watch you squirm and fall apart beneath him.
• He can't help himself but to lean in and growl low, telling you mixtures of threats and affections.
• He digs his nails into your soft skin, drawing blood and whimpers.
• His tongue trails over the cuts as the bitter metalic taste coats it.
• He grabs at your shoulders and thighs, sinking his teeth and nails into you wherever he can.
• He lifts your hips and turns you onto your stomach, clutching your thighs and groping your ass.
• He presses down on the centre on your back, forcing you to arch so he can thrust deeper until he cums deep, straight to your womb.
• When he's done, he slowly winds down and rests his head on your back, saying sweet nothings tiredly, promising to help clean up and patch up in a bit after a break.