Chapter Text
One simple mistake cost him this mission. One lapse in judgment, and he was played right into the Abyss’s hand. Diluc thought you were just another adventurer that made a wrong turn into the wrong domain when you approached his camp, bloodied and bruised, claiming you escaped a domain teeming with Abyss creatures. In retrospect, it seemed all too convenient that such a lead literally approached him.
But you bought your time, stayed with him while you “recovered from your injuries”, waited for him to ask you where this “domain” was, playing dumb, and dropping bits and pieces of what could be considered “all you can recall.” until finally one night, when he believed you were deep asleep, Diluc snuck off to find the domain.
He made quick work of your companions, as expected from the infamous Darknight Hero. Despite all that, he would still of course be shocked that the weakened adventurer he left in his camp was suddenly right in front of him, standing as if they never got injured at all. And that’s all you needed to disarm him and leave him trapped underneath you.
“I knew you were smart enough to find your way here, all from my vague hints. You didn’t disappoint me.” You’ve discarded your human disguise, in favor of your true form. A towering abyss lector, violet strikes of energy emanating from your body, surging through Diluc’s thrashing form. In your human form, you can appreciate just how bulky he is compared to other humans, tall, broad, muscular, fitting to wield a heavy claymore. Now both his wrists can fit into your one hand.
“I must admit, you’re even cuter now that you’re much smaller than me.”
He momentarily stops struggling to spit venom at you. “Don’t patronize me, you Abyss scum!” If only he can wrench out of your grip, he can jump for his weapon across the room and slice right through you. He was met with your mocking laughter, the familiar sound of your human voice overlaid with that inhuman strain.
“You misunderstood me Master Diluc, I’ve genuinely grown fond of you the past few days! You’re quite endearing despite your prickly personality.” A clawed finger traces Diluc’s jawline, leaving a jolt of electro energy in its wake. You picked up how his breath hitched, and there you concocted a wicked idea.
“Listen to me. I don’t want to kill you Master Diluc, but I can’t have you acting like this. Seems that I’ll have to find a way to placate you.” Diluc’s stomach dropped when he felt your free hand tracing up to his belt, sharp claws scraping his stomach. He didn’t even register that you’ve already pulled down his underwear, leaving him exposed to the cool stone floor of the temple. He couldn’t get out, the more he squirmed the tighter your grip on him was, the best he could do was hold out until you were done with him.
“Damn you, sick bastard!”
“Oh? But you’re the one that’s hard when I barely touched you.” A chill runs down his spine as his breathing stutters. Fuck, why was he aroused by this. “Don’t worry Diluc. I won’t harm you.” You let out an animal like purr as you run your hands across his body, Diluc couldn’t believe how gentle you were being, how such a heretical creature was touching him so lightly. That and the purring almost made him forget what exactly was happening to him. While he was still squirming and cursing you out, he seemed to have lost the need to escape from your hold. Good.
What happened next made him tense once more. He discovers that you have a mouth, not only that but a tongue, long enough to wrap around his thigh. Diluc’s hands clamped over his mouth, trying to suppress a moan as it runs up his torso, and land on his chest teasing everything but the hardened bud. He only caught a glimpse of a mischievous glint in your eye before you send another surge of electro through your tongue once it finally wraps around a nipple. Diluc keens, thighs trying to clamp shut in an attempt to get some friction, only to remember that you’re sitting firmly on top of them.
“Ffuck! Just get it over with!” Diluc’s attempt at a shout only comes out as a desperate whine, and you couldn’t help but chuckle. He’d rather die than admit that your condescending laughter made his dick twitch. “My, suddenly you’re so eager Diluc.”
You were happy to indulge him though. Shifting yourself between his legs, you move your hands to hold his hips, creating new scratches on his already scarred skin. “You’ll thank me for prepping you.” Your tongue once again slithers out, licking up his thighs, purposefully avoiding his cock that is pathetically weeping a pool of precum onto Diluc’s stomach. Your gaze then shifts up to Diluc’s face, you can't help but be disappointed that he’s still trying to hold himself back. Still only letting out ragged breaths, and biting his lip so hard it’s drawing blood.
No matter, he’ll relax soon enough. Was your thought before sliding your wet tongue over his hole. Diluc gasps, hand shooting out to grab your horn. You stop, expecting him to try and pull you off, but realize he’s making no effort to push you away. To calm him down your thumb runs circles on his hips, purring assurances at him. Eventually, he relaxes, hand falling back to his side. You try to ease your way into him this time, licking around the skin, leading into you probing your tongue back into his hole. In time he soon relaxes, allowing you entrance.
The way his shout died into a moan when you find that perfect spot lets you know that he’s finally lost the urge to fight and you hummed, delighted.
You start slow, steadily building up speed, making sure to savor the Darknight Hero’s moans as you hit his prostate. Diluc on the other hand quickly grew impatient, trying to slam his hips down onto your tongue, leading you to tighten your grip onto his hips, the scratches starting to bleed.
“Dearest, if you don't let me do this, what happens next will hurt.” You scolded him, sounding more like a warning than a threat. To that Diluc groans, throwing his head back in defeat. “So adorable.”
He huffs until you continue your work, and to his dismay you once again let out electro energy whenever you hit that spot, making his vision turn white. “W- wait! I- I’m–’m gonna!” He chants a string of moans when you suddenly pull out.
“Wh- why did you– Why did you stop?” He lets out a weak whimper.
“I think you’re ready now.” Diluc barely registers your response until he felt something blunt kiss his hole. His eyes shoot open, gawking at the tip of your length pressing against him. He knew you were twice his height, but he still couldn't imagine your size. Seeing his apprehension your hand goes back up to his face, carefully rubbing his cheek. “Just relax, you’ll be fine.” You promise as you ease yourself in gently, carefully watching Diluc for any sign of pain, reminding him to relax. Thankfully you eased in without much trouble, by the time you’re sheathed as far as you can go, you’re both panting. Diluc’s limbs have fallen limp as he can only focus on how your dick was creating a prominent bulge right under his belly button.
Your raspy laugh almost breaks his daze “Haha, I’m surprised you took me so well. Good pet.” He started sobbing at the nickname, unsure if it was from the pleasure or the humiliation of becoming pliant to an unholy being.
Once you’ve calmed down, you began rocking in and out of Diluc, enjoying every pant and moan that escaped him. You relish in the way he pulses around your cock, rewarding him with another electro shock whenever you hit his prostate. The initially quiet man was now screaming as you quickened your pace, now focusing fully on your own pleasure. Your claws drag down Diluc’s hips leaving behind gashes while he cries from the pain and pleasure. You watch the swell of your dick slide in and out of his stomach, pressing down on it as you do, making you both let out a moan.
At this point Diluc lost all memory of why he was here, that he was here to kill you, that you led him here as a trap. All that matters is that you finally wrapped your hands around his dick, roughly pumping him until he spills into your hand.
The following morning he awakens back at his camp, with a throbbing headache. His clothes intact, and greatsword lying right beside him. He almost believed the events of last night were all a dream (or a nightmare) if it weren’t for his limbs feeling like they were going to give out under him. Despite that he brings himself to return to the Abyss stronghold to finish the job only to find it has been vacated without a hint of where you ran off to next.
For your own sake, he prays you don't meet again.