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“S-sorry, sorry, sorry-!”
If Red Son ended up conditioned into getting hard whenever MK apologised, he was going to be furious.
MK’s hips snapped against his ass in a filthy smack, his cock swinging underneath him as he was filled to the brim and several inches past it. He felt like a pendulum, jolted forwards by the sheer force of MK and yanked back seconds later to meet his cock in another earth shattering thrust. Every connection was so thick, so deep, so perfect it left Red Son gasping for air.
“Sh-ut up-!” Red barely managed to hiccup between cries, his typical bravado shattered somewhere between the second and third orgasm,
“I can’t help it! You’re so tight, Red, you’re so tight and soft a-and wonderful…” MK kept fucking talking. He leaned down from their position of fucking Red Son like a dog, pressing against his back and fitting perfectly against him. Red could feel the cool metal of the wire muzzle bumping against his neck and shoulders, as if MK kept trying to kiss and forgetting he couldn’t.
As though he hadn’t asked for this. Hadn’t come to Red Son with tears in his eyes, begging for restraints. For something to protect the people he loved from his own chaotic tendencies. If Red could do anything that required cognitive thought right now, he would roll his eyes at the very memory.
But he was nothing if not an inventor. So he’d designed a muzzle, a collar and mittens, all designed to withstand the chaos that lay within the Harbinger of Chaos. Whether they actually worked was another story - Red was too destroyed to record any data, so fucked out of his mind he could barely snarl.
“Be good.” Red snapped between gasps for air, fumbling for the leash wrapped around his hand and yanking hard. MK followed with a broken whine, grinding his hips in so deep that dripping cock was practically kissing his heart. Red’s leg kicks out, helpless and completely ineffective as MK’s sheer force keeps his hips up.
“Be good,” He repeats, clinging to the little control he had, “I’ll take care of you. Don’t I always?”
“You do.” MK sniffled, his cock twitching so hard that Red could feel it in his guts and clench down onto it.
“S-So good, good, good- I’m gonna melt, oh, oh-!” MK started to shift, rolling his hips in a filthy swirl that made Red Son shout.
His back arched, pushing harder against MK before he kicked out again - this time, with purpose. He twisted to the side, mourning when the cock slipped out as he rolled onto his back.
MK, clearly stunned, stayed obediently still. His cock was less obedient. Red could look down, see it twitching in the cold and dripping pre onto his stomach.
He had tears in his eyes.
Red Son faltered, reaching up to cup his face and wipe his tears away. The muzzle pressed thin lines into his palm.
“Mine.” He murmured. He used the leash to guide MK down again, close enough to press a kiss against the end of the muzzle.
“Fuck me again. You can do that, can’t you? You’re good. My good, good boy.” MK’s hips jolted forwards every time Red Son praised him, his pupils blown and controlled by animalistic instinct. His open mouthed panting revealed thick, sharp canines, dripping with saliva that fell through the muzzle and right onto Red Son’s flushed face.
“Oh, you- filthy animal!” Red Son’s affection died in seconds as he turned his head to the side, growling as MK followed and fucking rubbed his drool covered muzzle against Red’s cheeks.
“Just fuck me! Now!”
MK obeyed. He used his mittens to pull Red’s legs up to loop around his waist, holding on tight before he pressed against that swollen hole and slipped back into fiery bliss.
Red can feel himself spasming around it, forced to stretch open wide again and accept every inch into himself as MK nuzzled back into his neck. No more drool on his face, at least.
“I wanna suck you off again.” MK panted, beginning to babble once more. “B-but I don’t wanna bite you. Maybe - maybe you can fuck my thighs. Or my hole, or my feet, or anything - anything you want, I’m yours to use.”
“Shit. Mng,” Red throws his head back, eyes rolling into his head as fire sparks off his hair, “Don’t stop.”
He didn’t. MK began a steady jackrabbiting rhythm, moving with superhuman strength to the tempo of wet slaps and Red’s gasping moans.
Red is close again, already. He’s not sure he has anymore in him, not sure his body can take another tidal wave of euphoria, but MK seems determined to wring it out of him anyway and his cock is happily twitching in agreement.
Next time, they’d go slower. Red Son wouldn’t make the mistake of letting MK pin him down, would ride on top instead and control the pace. He’ll appreciate MK’s cock properly, maybe take it into his mouth and show him how a demon controls their fangs, accepting a mouthful of cum and then forcing MK into a kiss to share so he could see how the Monkie Kid liked being spat on next. Next time felt like miles away. If MK had his way, it would be in a few hours.
The idea of going through his world shattering pleasure again made him reach up and yank on MK’s hair. Somehow, MK managed to buck even deeper, pushing Red several inches up the bed with a husky moan of pleasure.
“I’m gonna - cum-” Red groaned, his legs starting to twitch and kick with more irregularity as he lost control.
“Can I?” MK’s teeth clanked together next to his ear, his muzzle the only barrier between his deadly bite and Red Son’s soft neck. The thought leaves adrenaline shuddering down his spine.
“Can you what?!”
“I want to cum too,” MK was crying again, fucking harder and faster until the impact of their hips was loud enough to overshadow their conversation. “Please, Red, I’ll be good, I’ll be so good, I’m sorry, please let me fill you I’ll be so good it’ll feel so good I’ll take care of you-”
Red Son moaned, enjoying the pathetic pleas a little more than he should.
“O-okay, okay, come with me- M-K-! Fuck!”
Taut as a bow, Red convulsed as broken cries and gasps of MK’s name spilled out of him along with ropes of burning hot cum splattering over his own stomach.
MK thrust in deep one, two, three more times, working as deeply as he could before his own orgasm graced Red’s oversensitive guts with another load. The boy doesn’t ease up until Red Son starts to whimper, little shocks of overstimulation pulling more sweet noises from his lips.
“R-Red…”
Red Son closed his eyes to focus on catching his breath as the unbearable pleasure tapers into something a bit more manageable, periodically tightening and loosening around MK’s half deep cock.
“You,” Red swallowed, licking his lips, “Are a beast without manners. That’s why I keep you muzzled. Nothing to do with chaos. Once you’re trained, you can kiss me. Perhaps.”
MK jerked, his entire body shuddering over Red Son.
“Red…”
Maybe a moment too late, Red Son realises that MK never went soft.
“Can we go again?”