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glowingbadger · 3 years

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Okay hear me out. Seteth in a dragon heat. He’s a bit more dragon during this. But he he tries to deal with it in his own but is kinda is failing until his partner finds him and wants to help him out.

Ooh ho ho, I see the monster fucker side of the Seteth Venn Diagram is out and about today~

((The Seteth Venn Diagram, by the way, is one circle "Monster fucker" and one circle "priest kink"))

cw: Heat, mating, implied breeding kink

In Heat!Seteth x AFAB Reader

NSFW 18+

You never know what to expect when Byleth approaches you, given their perpetually neutral expression. But it certainly isn't this.

You'd been about to visit Seteth at what should be the end of his work day; you find that sometimes he needs help prying himself from his desk even long after official work hours. And yet, when you reach his door and glance into his meticulously kept office, he's nowhere to be found. That's when the Professor's familiar voice reaches you from down the hall, calling your name as they approach at a brisk walk.

"Just who I was hoping to see," they say, and you can already tell from the unusual trepidation in their tone that something is amiss.

"Oh, can I do something for you, Professor?" you say with a curious frown.

"Yes- er, well, it's... a bit odd," they sigh and run a hand through their hair. You try to wait patiently for them to find the words, but your heart picks up and you can't help a tinge of anxiety.

"I only have so much information myself, but Seteth seems to be... unwell."

You step forward immediately, your concern painted plainly across your face. Heart pounding, you prompt,

"Is he alright? Where is he? Has he seen a healer? Seteth never gets sick, you know that-"

"Please, Y/N," they say firmly, planting hands on your shoulders to steady you and seize your focus. You breathe deeply, but look at them beseechingly for reassurance. They scowl and sigh once more, "In truth, I'm only working from a hunch and a bit of information I... stumbled into. Just- go see him, okay? He should be in his quarters. He doesn't need a healer- he needs you."

Barely managing to suppress your growing concern, you head quickly to Seteth's quarters on the third floor. Had he missed an entire day of work? Nothing short of a plague could cause him to do such a thing, ordinarily. And what could he be battling right now that a healer could not at least soothe to some extent? With these thoughts and more whirling through your mind, you reach his door and knock firmly.

"Seteth?" you call, and you try the handle of the door only to find it locked, "Seteth, are you in there? I heard you're not well-"

"You should not be here."

His voice is lower and harsher than usual, rasping slightly as you hear him just on the other side of the door.

"Can I come in? Please, I'm starting to get really worried about you- I want to help in any way I can."

"This is none of your concern." he insists with growing agitation.

"I won't leave until I can at least see you." you say firmly.

A silent pause follows. Then, an agitated sigh, and he opens the door between you. He looks positively haggard. Stress and lack of sleep are heavy in his eyes, his hair is rustled out of place. But perhaps more notably, he's barely dressed, in only the white breeches he wears under his robes. His face and chest are flushed a ruddy pink, and his posture is tense, every muscle of his body seemingly ready to flee or strike as he looms over you in the doorway.

"Seteth, you-"

He growls your name in a bizarre, fevered tone you've never heard from him before. His hand grips the door frame as though holding himself up- or perhaps holding himself in place.

"I'm well enough, as you can see," he says in direct defiance of everything you plainly see to indicate otherwise, "Leave me. I- I can't bear to have you near me right now."

His breathing is somewhat labored, you notice, and his usually clear and focused eyes are tinted with something heady, dangerous. Not to mention that he's never spoken this way to you before. You step towards him despite his words and raise a hand to his forehead. Even in the split second of contact before he seizes you by the wrist, you can tell he's unusually warm. He speaks your name once more, this time sounding like both a plea and a warning.

And then you begin pick up the scent of his room- a masculine, earthy scent that you've noticed about him before, but is now wrapping around your senses and pulling your focus. You notice that his bed is in a state of disarray, sheets piled and wrinkled in every direction. And you take another look at him- a more thorough scan of his body before you. When your eyes land at the front of his breeches, your eyebrows raise, and the truth of his situation begins to take form in your mind. Your jaw tightens as you meet his eyes,

"Seteth..." you say cautiously, "Are you- that is, do Nabateans... go into heat?"

He swallows hard, the front of his throat bobbing, and says,

"Something... akin to that."

You wrest your arm from his grip and take his hand in yours instead.

"Let me help you."

"You don't know what you're offering." he replies, moving to turn from you. But you tug him back by his hand and stand on your toes, pressing your lips to his, and his body immediately responds. Seteth inhales sharply through his nose and holds your face in both of his hands, deepening the initially gentle kiss into something fierce and hungry. His tongue thrusts roughly into your mouth, and his hands run down your neck, along your breasts, down to your waist where he pulls you against him and into his room. One of you kicks the door closed- in your frenzy, you're not even sure who- and before you realize it, you're pinned to the hard wood.

"You can't imagine how it feels," Seteth groans against your neck between harsh bites and messy, open-mouthed kisses, "My blood is burning. Everything in my body and mind is demanding that I mate- that I claim you."

"Then- then do it," you half-moan, fingernails raking down his muscled torso. You can feel his manhood, hot and achingly hard, straining against his clothing and rutting against your body as he kisses you.

"It... won't be how it usually is," he says, and his hands grip more tightly at your hips. Even so, he can't tame his need to taste you, to mark you, even as he gives this final warning. You grit your teeth, while his bite down just below your jawline, immediately and conspicuously bruising the skin.

"That's fine," you breathe out, "do what you need to. I can take it."

Without another word, you're swept up into his arms, but not tenderly as you'd expect of him; rather, Seteth holds you firmly to his over-warm body as he brings you to his bed. He's possessive, hungry, his every touch is a signal of what's to come. The moment you're laid among the mess of sheets on your back, he's above you, pinning your wrists down hard as he kisses you with an intensity that's hard to even keep up with. But, Goddess help you, it's an incredible rush to see your stern and dignified lover like this- driven only by his desires, blind to everything but the need for relief.

Your legs part for him instinctively, and your heel nudges the back of his thigh, urging him closer to you. With a low groan, Seteth's hips fit between your thighs, and he ruts the needy length of his cock against your heat. He's panting when he parts from your lips just enough to speak,

"I... I should ready you." He says it almost regretfully. Clearly his desire to be good to you even now, to be your gentle and caring lover, is deeply at odds with the fire burning hot in his core. You realize his absolute desperation to enter you, and you give what you hope is an encouraging smile when you say,

"I am ready. Fuck me, Seteth."

True enough, you can tell you're plenty wet for him even without much direct stimulus. The rush of seeing Seteth like this has aroused you more than you'd even realized until this moment, and you find yourself more than eager to give him what he needs.

He makes good on your permission; he can't undress you fast enough for his liking, and it's this that brings to your attention what must be more of the physical effects of his heat. His nails, while not necessarily sharp, are longer and more powerful, almost claw-like as his strong hands tug at your clothing harshly enough to wear the fabric and damage a button or two. His pointed ears are flushed a dark red, and somehow seem more prominent- as are his canine teeth, as you'd noticed when he kissed you. Then, as you lay bare beneath him and he tugs your underwear down your legs, his gaze meets yours in one final deference to your consent. His pupils are elongated into reptilian slits, the green of his irises hypnotically vibrant. If he weren't so beautiful, he'd be terrifying.

The last of his own clothing joins yours on the floor beside his bed. You glimpse down and see his member throbbing and already drooling precum, you see the veins along his shaft bulging far more prominently than usual, and the head tinted to a dark, angry red. Pupils blown wide with lust, your heart thudding against your chest, you only have a moment to register what that massive cock is going to do to you before the thick head of it is pressing between your lower lips.

His first thrust is entirely inelegant, ruled only by his need to be inside of you. You gasp as in one harsh motion, he drives into you to the base, barely giving you a moment to register the overwhelming stimulus of the contours of his member dragging against your inner walls.

"Finally-" he snarls over your panting gasps, gritting his teeth as his nails dig against the flesh of your thighs. You're still adjusting to his girth as it strains out against your tight little cunt, stretching you out around him. With his cock held tight inside of you, he quickly and roughly maneuvers your legs upwards, resting your knees on his shoulders. Leaning over you pressed down against the mattress beneath him, his hips begin to buck against you.

His pace is deep and harsh, a tinge of pain among the immense pleasure mounting within you each time his tip hits your deepest point. Seteth watches your expressions with dazed and lustful eyes. He seems only half present, his mind wrapped in bindings of obsessive need. Before long, the force of his thrusts has pushed you back a bit on the bed, which he rectifies by seizing you by the hips and pulling you back to him. You gasp and cry out his name, but your voice hardly reaches him. His cock pounds into you over and over, coating himself with your juices, thick veins grinding against your soaked pussy walls, which clench and cling around him in turn.

All the while, you're treated to a range of moans and grunts that you've never heard from Seteth before. He's abandoned all sense of propriety in the pursuit of conquest, either oblivious or apathetic to the idea that anyone might overhear. Eventually, you see him grit his teeth, feel his member swelling and throbbing deep within you. He's close, and you're not even sure how many times you've cum around him by now. Perhaps it's the frenzy of his heat consuming you both, but you find you don't have it in you to care- you only know that you need him, that you can't think of anything but this powerful cock slamming into you.

Without warning, Seteth leans further over you, his hands gripping the sheets on either side of your head. The pressure of your legs being pushed back this far only causes your lower muscles to tighten around him, and that's when you feel it. With a wild, almost feral groan, his entire body tenses, he pushes his cock as deep into you as it will fit, and then, the heat of his release. Your lips hang open, letting out panting whimpers as he fills you almost instantly. Seteth holds himself in you to the hilt as he pours wave after wave of his cum into your waiting cunt. Though your own vision is dazed and blurred, you see his eyes roll back a bit, his chest heaving with exertion.

Then, it's over- only for a moment. Your legs fall limp around his hips, and you're given just a few seconds to breathe before he begins to grind into you once more. Raw and over-sensitive, you gasp out his name, but he only continues to fuck his own release into you, the overwhelming size of him preventing even one drop from spilling. He looks you in the eyes, his own bearing a wild edge you've never seen in them before.

"I need to fill you," he says, his voice rasping in his throat, "My very blood- everything that I am demands it. I... I can't stop now..."

His cock hasn't softened in the slightest, and it's not long before he's thrusting into you as deep and hard as he had been before his release. You barely manage an encouraging moan, but it doesn't seem he has any more need for your encouragement. Seteth lowers himself to press a messy, fevered kiss to your throat, his teeth bruising and marking you as he works his way down towards your chest. His mouth surrounds one of your nipples and proceeds to ravage both as he pounds into you, suckling at them harshly, tugging and rolling them between his lips. Your thighs tremble around him, your voice hoarse when you moan aloud, and yet you know he won't be finished with you for some time. And in some blissful, maddened part of your mind, you desperately want him to ruin you.

When he reaches his next climax, his cum has overfilled you such that not even the incredible girth of his cock can keep it all inside of you now. Your aching nipples stand hard in the cool air against the heat of where his mouth had been, your chest rising and falling with your labored breath. Without a word, Seteth pulls his cock out from you for the first time. The absence of such a massive intrusion leaves you feeling empty- but you know you won't have to be without him for long. His strong hands force you over onto your stomach, then grab you by the hips and prop your ass up in front of him.

"Oohh-! Seteth..!" you do your best to hold yourself in place for him as he pushes his still-solid cock into you once more, but instead, he grabs onto your hips for leverage, rendering your efforts useless. This is how he takes you for some time afterward. With your fists clenched tight around a pillow and your ass bouncing against his body with every thrust, Seteth bucks into you over and over, filling you again before long, yet still not satisfied. Even when your entire frame trembles and you lie limp beneath him, he follows you down onto the bed, his muscled body pressing you down onto the sheets as he desperately chases relief.

Does he cum once more after this, twice perhaps? You lack the presence of mind to even tell anymore. You've long since been reduced to a gasping, whimpering mess beneath him, eyes hazy and unfocused, hair tossled out of place, and your cunt dripping with load after load of his seed. Then, at long, long last, Seteth exhales a heavy groan that you're certain must be heard throughout the third floor, and he eases his manhood out of your abused little cunt. You shiver at this last delicious bit of friction between your bodies, and the far more tender way his hand caresses the curve of your backside as he gives you one last lingering gaze.

Then, he practically collapses onto the bed beside you. You've regained your breath just enough to chuckle softly as he lies boneless at your side. You both take a moment to collect yourselves, but before long, Seteth turns toward you on his side and reaches out a shaking hand to brush back your hair.

"Thank you, my dearest love." he murmurs, wearing an earnest smile free from the weariness he carries with him so often. Even after all he's done to you today, you find that smile causes your heart to flutter and your face to warm. You take his hand in yours and move closer to him on the bed.

"So is... is that it then?"

"No, I'm afraid not." Seteth replies with a guilty sigh, "I am well sated for the time being, but... this 'heat' can last several days. And because mine has not occurred for so long, I anticipate that this time, it may be longer still."

Perhaps he was expecting apprehension or even frustration, but instead, you grin, biting a bit at your lower lip.

"Well, it seems I have my work cut out for me then."

Seteth gives a shy laugh and kisses your forehead gently. Then, he yawns, though he attempts and fails to stifle it. You smile warmly and say,

"We should clean up before you fall asleep on me."

The following morning is the first time you've ever woken up before Seteth. He looks positively serene, more like a Saint than you've ever seen him. At first, you're content to lay by his side and enjoy the peaceful tenor of his breathing. Though, eventually, you glimpse downward out of curiosity. Sure enough, his member stirs slightly, gradually swelling with need. Your eyebrows quirk upward and you give a playful half-smirk. Seteth had hoped to be back to work today- but he had implied that he may need your help to remain calm and focused.

You carefully ease up onto his lap and straddle his hips. Then, your fingers weave into thick green hair, and you kiss him until he begins to wake. He's clearly surprised and a bit perplexed on first waking, but he soon relaxes and smiles, wrapping his arms around you and kissing you in turn.

"It has been centuries since I last slept so well," he says softly, "And now, to wake to such lavish treatment..."

You smile and place a very sweet, innocent kiss to his lips.

"You said you'd hoped to work today," without warning, you shift your body against him, grinding your warmth along his stiffening member, "So I figured I'd take care of you first thing."

Seteth moans and his hands grab hold of your thighs, his head tilting back on his pillow as you tug down the front of his pants and begin to align the tip of his cock with your entrance.

"Goddess, Y/N," he murmurs into the quiet of his room, "you truly are my salvation."

#Byleth read about dragon heat in the Abyss #And then teased Seteth about it for weaks #this poor man #seteth #fire emblem #fire emblem three houses #fe3h #feh #seteth x reader #fire emblem x reader #fire emblem smut #fire emblem imagines #seteth smut #x reader

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