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Xiao stills the moment he slams the door open, his eyes straining wide open as his fear is confirmed as he looks in the dark of the bedroom, the bed creaking violently where Zhongli pounds his cock into Aether's—his lover's—hole, Aether struggling under him with weak limbs.
He had heard Aether call his name, yet it appears he was too late.
Aether's eyes go wide as he notices Xiao standing in the doorway from where he lays on his back, his face tearstained and red, a harsh bruise on his cheek that resembles a handprint churningly well. Aether fists the bedsheets below him as he chokes back a sob, his back arching and chest heaving as he calls out to him, "X-Xiao, please... help m..me..."
Before Xiao can even take a step further into the room, Zhongli snaps his head around, his golden irises practically burning even in the dark as he growls at Xiao, "Stay."
An absolute chill runs down Xiao's spine, as if ice-cold lead is pouring into his limbs real time. The more he forces any of his muscles to move the harder they freeze up, even cramping up when he persists with more and more force, fear creeping into his whole body from his powerlessness to help and the terrifying control Zhongli has over him.
He had never expected Zhongli to take advantage of Aether, not with Zhongli fully aware that they were together, and so he can't stop the tears from falling as he pointlessly strains in place, teeth clenching and eyebrows furrowing in the agony of not being able to do anything as Zhongli continues fucking his large cock into Aether's tight hole. The angle from which Xiao observes is also nothing less than cruel, as he can see the rim of Aether's ass stretching each time Zhongli feeds his cock into him, swollen and abused around Zhongli's two cocks squeezing inside.
Aether wails and cries harder as he understands the cruelness of the situation, throwing his head back and trying desperately to squirm away from Zhongli, only causing more pained cries to fall from his lips as Zhongli tightens his bruising hold on Aether’s waist, practically fucking him on his dick instead of moving himself.
Zhongli casts his twisted and apathetic gaze back to Xiao as he questions, his deep voice reflecting his twisted enjoyment in raping Aether in front of Xiao, "Fuck... your bitch is so tight... do you even fuck him...?"
Before Xiao can even bite back the harshest insult he knows, Zhongli laughs to himself and cuts Xiao off, "Silence."
Zhongli lets out a guttural groan of pleasure and returns his full attention to fucking Aether as Xiao's lips are sewn shut, more and more groans resonating deep in his throat with each harsh thrust of his hips and Aether’s high-pitched cries. His hands begin tinting black, geo starting to course through his veins as his neat fingers grow into sharp, pointed nails, which Zhongli doesn't hesitate to dig into Aether's sides until Aether bleeds and cries out in hysterical pain, the blood seeping out of him in streams and coating the covers under them red.
Xiao squeezes his eyes shut, seething in anger at himself for not being to help, yet not wanting to watch Zhingli raping his lover and taking enjoyment in it, but Zhongli doesn't spare him even that, "Watch."
Xiao's eyelids are pried open by an unseen force, and, no matter how much he tries, he cannot do a thing to shut them. His eyes meet Zhongli's and the old god smirks, deranged and knowing, fully aware and joyful of the torture he's bringing upon both Xiao and Aether.
Xiao wants to scream and cry and apologize as Aether looks at him apologetically between his own tears, but he can only grit his teeth and painstakingly endure the scene in front of him, sadness and worry building in him the longer Zhongli is rough with lover.
"I-it's—uHNN-NHA—oh-okay.. X-Xi—!" Aether's consoling words are cut short as he chokes with a painful gurgling noise as Zhongli grips his throat, his hand big enough to wrap around his entire neck. Xiao's eyes shoot even wider in fear as he shakes his head to himself in pure panic, aware how Zhongli could snap Aether's neck in a moment if he so wished.
"Your bitch is so fucking noisy," Zhongli snarls and laughs at the same time, his laughter too light and happy for the situation, fully throwing his head back before regripping Aether's waist, lifting Aether’s butt off the bed a little as Zhongli angles himself for a deeper fuck, which immediately wrings chocked sobs out of Aether as Zhongli's massive cock fucks him too deep and too raw, no slick or lube anywhere to comfort the thrusts.
Zhongli doesn't let up his forceful grip on Aether’s neck even as Aether trashes harder and harder, his eyes rolling back into his head, his lungs burning for oxygen. Zhongli only focuses on prioritizing his own pleasure, his guttural groans increasing in volume, almost drawing out the violent creaking and shaking of the bed with each loveless thrust.
With a final, almost feral grunt, Zhongli climaxes with a deep and pointed thrust, spilling all of his come as deep as he could inside the boy, rutting against him in quick and animalistic thrusts to fully milk all of his come deep into Aether in many spurts, until the flow of his seed eases completely.
He lets go of Aether's throat and pulls out of him at the same time. Aether's hips hit the bed with a soft thunk before his own hands spring to his neck as he gulps down air, his body trembling yet numb, clutching at himself as if to help himself breathe better.
Xiao waits and waits for the few agonizing seconds it takes for Zhongli to get out of bed and collect his clothes in a heap in his hands, before stepping past Xiao in the doorway with a soft hum, "Do as you wish."
A part of Xiao—the blood boiling in his veins and hate festering into black smoke around him—wants to pounce and murder Zhongli right here and now, spear him on his polream in the most painful ways he knows, cut him into a million unrecogniable pieces, but his contract with Zhongli also forbids this, and his hate simmers out so quickly as he hears Aether's pained and weak gasps, then he's at Aether's side in a second, forcing himself to ignore Zhongli's amused chuckle.
He gathers Aether in his arms and into the part of the blanket not stained with Aether’s own blood, rocking him and breathing with him, assuring him he would be okay, telling him he'd fix all his bleeding scratches while Aether cries all the while, hating for how long Zhongli stands in the doorway with an increasingly satisfied smile until he finally leaves.