Archive of Our Own ^beta

His whole life, Koga lived by the rules of the pack. Some were pretty standard, most reasonable, and a couple of ones he and his peers would break more often than not. But there was a single rule no one dared to question.

Never, in any circumstances, mingle with the vampires.

Maybe you’ll laugh at it, perhaps you believe this is something straight out of a fantasy book. And certainly, you have the right to think that. But Koga’s species was also something you would only expect to see in fiction, and yet here they are. Living, breathing, real werewolves.

And so were vampires.

For most of his childhood and teenage years, Koga had indeed abided by that rule. Not that he really needed to break it in the first place. Usually, the bloodsucking night creatures would stay on their turf and Koga’s pack would stay on theirs. No crossing boundaries, no hunting on each other’s territories, no big deal.

That is until a certain vampire boy decided to enroll in his school.

Sakuma Ritsu was peculiar , to say the least. Koga couldn’t really comprehend him. It was obvious he was at least a hundred years old, so why was he attending a human high school in the first place? He would sleep through classes but still ace all his tests with his accumulated knowledge of decades. Hang out with both boys and girls ready to serve themselves on a silver plate for him, yet he never fed from them. And he obviously could smell the wolf in Koga too but never teased him about being a werewolf like other bloodsuckers had done before.

Just what was up with that guy?

That question plagued Koga’s mind for months on end, but he never truly tried to get closer to the older one and ask. They were from two different worlds and as much as his curiosity was killing him he didn’t intend to break their most important rule just to settle his nerves.

Or that would have been the plan had Koga not found Ritsu that night in the music room.

The werewolf got held back that day due to remedial classes and after three tedious hours and thousands of numbers dancing around his head in formulas he could not make heads and tails of, he was finally free to grab his guitar and go home. Instead, when he set foot in the music room, he came across a panting vampire, pointy ears fully in display and eyes bloodshot as he seemed to writhe in pain.

Koga’s eyes shot open in shock, unconsciously stepping closer to the raven-haired boy.

“Hey, yer alright? Should I call someone?” He asked, for a moment forgetting about any differences between them (he didn’t want the guy to die, after all).

Ritsu looked at the door with hazy eyes, like he couldn’t really make out Koga’s form. 

“You…” He spoke in ragged breaths. “What are you doing here?”

“I could ask ya the same question. Whatcha’ doin’ here so late? ‘N why yer lookin’ like that?”

Ritsu coughed, hugging his stomach as if it hurt to speak.

“It’s none of your business, corgi. Just go back to your house and leave me alone.”

Great. Now he starts joking about Koga’s lineage.

“I ain’t a corgi, damn bloodsucker. ‘N should ya really be annoyin’ the only person who can help ya right now?” He growled.

“I never asked for your help. You should really go away, I can deal with my problems alone.” The vampire hissed back, but a sharp pain struck him again and he cursed.

“Yeah, not very convincin’. Ya know I could literally tear ya apart witcha’ vulnerable like that, don’tcha?” Koga raised an eyebrow.

Ritsu chuckled, finding it amusing.

“Do it then. Use this opportunity to rid the world of one more vampire. I dare you.”

The werewolf sighed, not willing to take the bait.

“How fun that’d be when ya can barely stand up to fight back?”

He steps closer to the vampire again, but a wave of nausea assaults him all of a sudden.

“What the-”

“I told you. You should’ve gone home when I said so, you idiot corgi. What are you even doing here this late? Don’t you know what day it is?” The smaller one asked incredulously, but only when the curtains of the music room moved with the wind and the moonlight shone inside did Koga realize his dumb mistake.

The moon was red. Tonight was a fucking blood moon and Koga had completely forgotten about it in his musings. Now that explained why Ritsu looked so out of breath and in pain. He wasn’t hurt, he wasn’t suffering from a disease. He was freaking horny. 

And so was Koga now.

You see, the blood moon was one of those rare phenomena that messed with the creatures of the night. Vampires, werewolves, fae; they were all affected by the power of that particular event. Meaning: they all kind of went into a rut (at least wolves would call it that way).

And now Oogami Koga was not only trapped with his natural enemy in an empty school but also quickly losing sight of what he should or shouldn’t do with said enemy.

Was Ritsu feeling as cloud-headed as he was? Was he also considering things that should have never gone through their heads before?

By his muffled moan and slight thrust of his hips, Koga would consider that a yes.

“Fuck,” the vampire said through gritted teeth. “Now you’ve done it, stupid mutt.”

Koga was taken aback, starting to pant as he got down on his knees.

“Whatcha’ talkin’ about, ya shitty vampire? You were already like that when I came in.”

“Yeah… But I wasn’t thinking about being fucked by you till you appear.”

Well, that answered his question.

Shit, the thought went against all principles Koga was raised by, but he was also so, so aroused right now that even the sight of Ritsu’s fangs poking out and his red eyes glowing in the dimly lit room were more of a turn-on point rather than a disgust one. Fuck, he could even feel his arms and legs trembling, the fur of his wolf tickling to come out.

Sucking on a breath and throwing his pride out of the window, the werewolf boldly said.

“If… If ya promise to never tell anyone ‘bout this… Then, I won’t either.”

To say that Ritsu almost came back to life with those words was the understatement of the century (and he could genuinely attest to that). But soon after the shock wore off, his lust came back tenfold.

“Wow, corgi. Are you really gonna ignore your pack’s rules and stain your claws with a filthy creature like me?” He smirked devilishly. “I’m surprised, never took you for a ‘bad boy’. But I guess we can’t judge a book by its cover, or a dog by its tag.” Now close enough to the silver-haired boy, the vampire tugged on his tie, like pulling on a leash.

Koga let out a low growl before starting to undress.

“Again, I ain’t a dog, ya shitty vampire. I’m a wolf, and if we’re doin’ this I ain’t holding back on ya.”

Ritsu had to bite his lip and hold back a moan as he watched the wolf slowly transform. First the fluffy ears and the tail, then heavy paws, sharp eyes and a black snout connected to a mouth full of white strong teeth. His silver-gray fur seemed to shine under the moonlight.

“Hell yeah, wolf. I can’t wait for you to fuck me like that.”

Ritsu started working on his own clothes, blazer and shirt discarded on the side before he moved to his pants. With his already wet underwear finally off, his girth could at last spring free, covered in clear precum as he smeared it around his head and nipples.

“I’m ready whenever you are. Come and have me.”

Koga snorted, but he could feel his shaft growing as well, slipping past the bundle of skin that kept it hidden in his wolf form. No, yer not , he thought to himself.

Despite Ritsu’s brief confusion, he soon felt a warm tongue sweeping his anus, leaving a moist trail from his back to his perineum once, twice, slicking him up in wolf’s saliva until his hole was lubricated and pliant enough for the beast to slip his large appendage inside. The vampire moaned at the invasion, Koga’s tongue was so hot it felt like he was being scorched, and so long it could easily reach his prostate with a simple flick. He was sure he could come just from being eaten out like that. No, scratch that, he was actually coming.

Long ropes of cum painted Ritsu’s belly and Koga’s snout as the vampire moaned loudly, the wolf not daring to stop his ministrations until he was fully milked. When his penis finally deflated and the vampire rested his head back, Koga took out his tongue and licked his face clean, then lapped the other’s come from his body as well. Ritsu was surprised at the caring action, but snickered in amusement, scratching the wolf behind his ears.

“Fufu, you really are something else, corgi.” Koga grimaced at the nickname again. “Alright, no corgi, I get it. Just… Can you please fuck me properly now? I don’t think I can wait anymore.”

The werewolf nodded with a glint in his eyes, tongue coming out again to lick at the vampire’s rod until he could feel it hard again. Shit, Ritsu was going to fall for him like that.

With great effort, the dark-haired beauty lifted himself from the ground and crawled to the piano bench, laying himself on top of it, stomach down and ass up for easier access to Koga’s massive wolf dick.

“Please, wolf. Fill me up already.” He pleaded, and Koga wasn’t one to refuse such a request.

Supporting his front legs on the bench beside Ritsu’s dark locks, he lined himself to the vampire’s entrance and slowly pushed in. Ritsu almost screamed at the intrusion, he never had something so big up his ass, and it felt like an eternity until every inch of it passed his ring of muscles and the wolf bottomed him out. 

Shit, he could feel Koga’s head poking his belly.

The wolf panted above him as if he was trying as hard as the vampire not to come in the first five seconds. But soon Ritsu’s patience wore thin and he demanded.

“Just move already. Need you to make me full, need you to impregnate me.”

Koga shivered at those words and something snapped inside of him, a bestial need he never realized he had. And with a growl, he started thrusting inside the vampire like there was no tomorrow.

Ritsu’s moans could be heard throughout the entire school, and he really hoped no one else was there at that unholy hour or he would actually have to kill them. But right now, his self-preservation was the least of his concerns, his head completely devoid of thoughts except for the shape of Koga’s cock imprinted on him and his head hitting the back of his stomach. He put a hand on his abdomen, feeling the rod pushing his skin forward, and just that sensation was enough to send him over the edge again, cumming on top of the piano bench with a scream.

“Fuck, fuck, fuck… Don’t you dare stop, wolf, keep railing me.”

Koga, of course, obeyed the command like a good boy, snapping his hips stronger and faster, his own orgasm rapidly building up. And the vampire was aware of that, the wolf’s grunts and hot breath scorching his back like a forewarning of what was about to come.

“Yes, yes. Come inside me. Fill me with your seed, put your pups inside me.”

That was enough to make Koga see starts, cock sending wave after wave of cum inside the vampire until his stomach was plump. The sensation of being filled to the brim made Ritsu come a third time, dry and almost painful after having his body abused by the beast for the past hour.

When Koga finally dislodged himself from his ass, he could actually see a little of Ritsu’s rectum following suit, gripping his cock as if he refused to let it go. As the head finally got out, a cascade of white semen splurted from his anus, soiling the floor around them. The vampire collapsed on himself, his whole body shaking as he tried to catch his simulacra breathing. The wolf sat beside him, and soon felt his tail and fur disappear, human body back to normal.

They weren’t sure how much time had passed until one of them broke the silence. In this case, Ritsu.

“Wow,” he simply said. “So that what is like being with a werewolf?”

Koga chuckled.

“Yeah, kinda. The wolf’s not always out, y’know?”

The vampire sat on the dirty piano bench (he would have to come up with a way to clean it later).

“Shame. I’d love to play with it again.”

Koga was taken aback, eyes wide as he observed his natural enemy (?) in the moonlit night.

“Yer serious? Y’know this was supposed to be a one-time thing, don’tcha?”

Ritsu shrugged.

“Yeah, but I enjoyed it. Didn’t you also?”

“I mean… I did, but…”

“Then, what’s the big deal? No one besides us has to know. This whole ‘vampires and werewolves don’t mingle’ thing is so antiquated anyway, it’s been at least twenty years since our kinds last had a field for food or territory. That has nothing to do with us.”

Koga was stunned beyond words. That guy truly was something, and the worst was that he couldn’t find fault in what the vampire was saying.

“What ‘bout those humans ya went out with?”

“Humans are boring. I came to this school ‘cause I was tired of being all alone in the mansion, but you’re by far the most interesting thing here, to be honest.”

The werewolf could swear he felt his cheeks heat up. He hoped the vampire didn’t notice.

“So ya want me to keep fuckin’ ya ‘cuz ya find me interestin’?” He asked, but there was no bite in his words (pun intended).

Ritsu chuckled.

“Is that not a good reason? You know, I kinda like you, corgi. You’re different from the other mutts I’ve met.” He smiled.

Koga actually had to hide his blush this time. He stuttered in his response.

“Y-You too… Yer different from those other bloodsuckers.” He couldn’t believe he was agreeing with this, but he would be lying if he said he wasn’t curious about where this was going. “Aight’, we can go out. But on one condition: ya have to stop callin’ me ‘corgi’ or ‘mutt’, deal?”

Sakuma Ritsu was a peculiar being, and although Koga now had the answers to many of his questions, there was still a lot more to unveil about that mysterious creature. And honestly, the wolf didn’t mind breaking one more rule for that. In fact, he could see himself enjoying unfolding that vampire in more than one way.

Ritsu laughed again.

“I can’t make any promises.”