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cheekycheesecake01 · 2 days ago

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Guys, I love whiny submissive Mark, I really do, BUT I NEED ME MORE DOM MARK I'M SO SORRY, AND FINALLYYYYYY A FIC WHERE REX GETS BRAT TAMMED LIKE I WAS WHISPER SCREAMING THE WHOLE TIME READING THIS

✦ ˚ : · DYNAMIC SHIFT · : ˚✦

pairing ☆ mark grayson x fem!reader x rex splode

word count ☆ 1.3K

summary ☆ rex has been annoying all day, and you and mark are tired of his brattiness

warnings ☆ oral sex (m! receiving), fingering, bratty!rex, soft!dom mark

main masterlist | letterboxd

Part 1

To say that you've been fucking wouldn't be enough.

After convincing Mark to stay the night with you and Rex, and the amazing morning sex, you and Rex didn't want it to be a one time thing. Mark balanced the two of you perfectly, and every time you spent together, he was getting more confident.

First with you, it was like Rex scared him a little. He talked to you, he made you reassure him a hundred times that you and Rex actually liked him and wanted him in the relationship. When it was only the two of you he fucked you slowly, deliberately and he even made you beg once. He let you peg him, his first time, and damn, he was moaning like a bitch the whole time.

With Rex is different. You know your boyfriend, you know how much he likes Mark and how much he talks about how sweet he is and how good his cum tastes. But he never tells Mark that, his way of showing his crush is being cocky, annoying and most likely a brat. So after a few weeks of Mark thinking, "it's just the way Rex is", he gets tired. And he goes to you.

"So, you wanna tame him?" you simply say, sipping your tea while you cuddle in Mark's lap after kicking out Rex of your room.

"What?" He is so embarrassed, can't even look you in the eye.

You smile, a little wicked, a little knowing. You reach up and brush your fingers through Mark’s messy hair, still damp from the shower you dragged him into after round two this morning. He’s warm beneath you, his thighs tense under your weight, his hands unsure at your hips.

“You heard me,” you murmur, leaning in close. “You wanna tame him?”

Mark flushes hard, his face going red all the way to his ears. He sputters for a second before managing, “I don’t— I mean, it’s not like— He’s just—”

“Impossible?” you offer helpfully.

He exhales like he’s been holding it in. “Yes. That.”

You hum, nuzzling into his shoulder. “He likes when you push back. You’ve noticed that, right? You roll your eyes, he gets hard. You talk back, he gets worse.”

Mark groans, covering his face. “God, he does.”

You giggle, wicked and pleased. “He wants it, Mark. He wants to see what you’ll do. You’ve already got him wrapped around your finger, baby. He’s just pretending you don’t.”

Mark’s quiet for a moment, processing that. Then: “But he never says it. Never… I don’t know. Acts like it means anything.”

You shrug. “That’s Rex. He’ll bend you over and make you cry, then call you ‘bro’ and offer to split a pizza. But he feels everything. He just doesn’t know how to say it.”

There’s a knock on the door, three short sharp taps. Mark tenses under you.

“Hey,” comes Rex’s voice from the hallway. “Are you two done being mean to me? Can I come back in or are you still talking shit?”

Mark glances at you, something unreadable flickering behind his eyes. You smile, soft and dangerous.

“Tell him no.”

Mark raises his brows. “Seriously?”

“Say it. Say no. See what happens.”

You feel him swallow hard.

“...No,” he calls out, voice just a touch unsteady. “We’re not done.”

A beat.

Then Rex, voice faintly choked: “Oh. Okay.”

Mark glances at you again, eyes wide.

You grin.

“That’s it,” you whisper. “Now you’ve got him wondering. Just wait.”

Mark doesn’t have to wait long.

A few minutes pass, tense, quiet, laced with anticipation. You stay in his lap, deliberately shifting just enough to feel the way he twitches beneath you, half hard again from the power rush, from you, from what he just did to Rex with a single word.

Then the door opens. Not slammed, not swung. Just pushed open with slow, deliberate force.

Rex stands there, shirtless and barefoot, his sweats hanging low on his hips, his expression unreadable. But his eyes, fuck, his eyes, they’re dark, burning, locked on Mark like he’s prey and Rex just remembered how hungry he is.

“You’re being a little fucking cruel, pretty boy,” he says, voice low, raspy. “Got me out there all hard and pacing like a damn mutt.”

Mark doesn’t flinch this time. He meets Rex’s gaze, and you can feel the shift in him again this sudden, quiet power that hums beneath his skin. He leans back a little, arms draped around your waist like he owns you, and maybe, he kind of does.

“You gonna whine,” Mark asks, smooth and even, “or you gonna do something about it?”

That stops Rex in his tracks. His jaw ticks. His tongue flicks across his bottom lip, quick and distracted. He wasn’t expecting that.

You’re practically vibrating, watching the tension coil between them. You tilt your head, fingers brushing over Mark’s bare chest.

“Take your time,” you tell Rex sweetly. “But if you’re just gonna stand there, you might miss the show.”

Rex’s eyes flick to you, then to where your hips are still resting over Mark’s, the outline of his cock visible now, pressing up through his boxers. Rex shifts, his cock tenting his sweats now, obvious, throbbing.

He moves. Slowly at first, but with purpose. He kicks the door shut behind him and crosses the room in a few strides, standing over the two of you at the edge of the bed.

Mark looks up at him, lips parted, eyes burning with something dark and delicious. “On your knees.”

Rex snorts. “The fuck—”

Mark’s gaze doesn’t waver. “You heard me.”

And you swear you see it, that flicker of something like fear in Rex’s eyes. Not real fear. Want. The kind that makes your stomach drop and heat pool between your thighs.

Rex hesitates, like it costs him something. Like handing over control is hard. But then, slowly, he drops.

Onto his knees.

You don’t know whether to laugh or moan. Mark looks down at him, this new confidence settling in his shoulders like it was always meant to be there.

“Take them off,” he says.

Rex obeys, dragging his sweats down, his cock springing free. He’s flushed, panting, watching Mark like he’s not sure what the hell just happened to his life.

Mark brushes his fingers down your spine, leans in close to whisper in your ear.

“You want a show?” he murmurs. “Watch this.”

Then he shifts you just enough to slide out from under you, standing over Rex now, just inches from his face. He pulls down his own boxers slowly, deliberately, his cock flushed and heavy and impossibly hard.

“Open your mouth,” Mark says, voice rough.

Rex’s lips part, obedient and already breathing heavy, the brat in him stunned into silence. Mark doesn’t touch him right away, he just stands there, cock bobbing inches from Rex’s mouth, watching him squirm. Watching him want.

You settle onto your knees on the bed, legs tucked under you, thighs sticky and clenching. You’re not about to interrupt. This is Mark’s moment, and you’re going to savor it.

Mark’s voice is low, steady. “You want it?”

Rex huffs, eyes flicking up. “You know I do.”

Mark doesn’t smile. Doesn’t laugh. He just reaches down, grabs Rex’s jaw, and tilts it open wider with two fingers.

“Then show me.”

Rex doesn’t hesitate again.

He leans forward and sucks him in—just the tip at first, slow, deliberate. His lips wrap around Mark’s cock, tongue flicking the underside like he knows exactly what will drive him insane. His hands go to Mark’s thighs, gripping for balance, and his eyes flutter closed like it’s relief to finally have his mouth full.

Mark lets out this guttural noise, somewhere between a gasp and a groan, his hand slipping into Rex’s hair. “Fuck, that’s it—good boy.”

You feel that praise in your core. Rex sure as hell does, he moans around Mark’s cock, a filthy, needy sound that makes your spine arch.

“God,” you murmur. “Look at you.”

Rex pulls back, spit glistening at the corner of his mouth. He pants, looking up at Mark with flushed cheeks and wet lips. “You’re such a fucking bully, dude.”

Mark leans down just enough to grab Rex by the hair, tugging his head back until he’s looking up at him fully.

“You love it,” Mark growls. “Don’t pretend you don’t get off on being put in your place.”

Rex groans, hips twitching like he’s about to come just from the tension alone. Mark pushes his head again against his cock.

He reaches your leg, making you gasp and pulling you closer to him. He kisses you slow, savoring your mouth like you deserve it. He takes one of his hands to snap your short's waistband.

"Still dressed, baby?" he flutters his eyelashes to you.

Your breath hitches, heart stuttering as Mark looks at you like that. The kind of confident that’s earned, not faked. His fingers curl under the waistband of your shorts, dragging the fabric down slow, like he’s unwrapping something delicate, something he already owns.

You lift your hips to help him, and he doesn’t waste time. His hand slips between your thighs, hot and sure, like he’s done thinking and just wants. You’re already soaked, and he groans when he feels it.

“Fuck,” he murmurs against your throat, lips brushing skin as he speaks. “Is this from watching me? Or from watching him?”

“Yes,” you whisper, breathless, grinding into his fingers.

Rex lets out a muffled sound against Mark’s cock, like even he can’t handle that answer. His eyes are glassy, his cheeks flushed, spit glistening on his chin as he keeps working his mouth over Mark’s cock, messy and eager and so fucking hot.

But you can barely focus on him, not with the way Mark’s fingers are sliding through your folds, two of them curling just right, pressing against that spot inside you like he’s trying to ruin you.

And he is. You don’t believe what Mark’s doing, how good he is, how filthy. He’s barely even reacting to Rex’s mouth anymore, too focused on watching you fall apart under his hand.

“You’re shaking,” he says softly, almost mockingly, as he slips another finger inside. “Didn’t think you’d be the first to fall apart.”

“Fuck you,” you pant, hips rocking against his palm.

He smirks. “You will.”

And then he crooks his fingers and presses his thumb right where you need it, and fuck, you’re gone. You arch back, a gasp torn from your throat, toes curling as heat flashes through your body like a live wire. You don’t even try to hold it in, Mark earned this. He deserves to hear you fall apart for him.

He groans, pulling his fingers from you slowly, watching them glisten in the low light. Then, to your shock, and Rex’s, judging by the noise he makes, Mark shoves those wet fingers into Rex’s mouth.

“Taste her,” Mark says, voice low, dark, commanding.

And Rex does, like it’s instinct. Like he needs it. He groans around Mark’s fingers, his tongue licking them clean like he’s starving for it.

You can barely breathe, watching it—them.

Mark leans in, his voice like a growl against Rex’s mouth. “You’re gonna make me come, then you’re gonna eat her out ‘til she forgets her name. Got it?”

Rex nods, wide-eyed, Mark’s fingers still in his mouth.

And you? You don’t think you’ve ever been this wet in your life.

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