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Edit: For the fucking sake, read the warning. It's there for a fucking reason!
In the forest, big like this one lived lots of different kinds of animals. Both preys and predators. Preys were scared of predators, and predators looked at them as lower species. But even there were exceptions. Katsuki and Izuku have known each other since they were little pup and kit. Even though Katsuki was a wolf and Izuku was a bunny.
When they met for the first time, Izuku was chased by a bunch of foxes. He knew that he wasn’t fast enough, still too young and legs not strong enough. He was sure that his end was coming, they were going to kill him. But they didn’t. Katsuki suddenly appeared there and scared the foxes off. Wolf was wandering around when he heard a scared squealing. If it took him only a few seconds longer, it could be too late.
He was already big for pup, so the foxes rather ran away than fight him. They just wanted to have some fun but fighting with a wolf wasn’t worth it. Katsuki didn’t try to hurt the bunny. Of course, he was making fun of him. What did this little thing thought, being alone this far from the safety of his home. But when he saw how tears started to cover bunny’s cheeks, he stopped.
He has never seen anything so cute before. Big green eyes so shiny from tears, long floppy ears hopping with every hiccup and the small but ultimately fluffy tail behind small body took his breath away. And that was why a while later he found himself sitting next to the bushes with for his own taste too much sweet red berries, where he took bunny to calm him down. And it looked, it helped.
From that day he didn’t get rid of this bunny. Somehow, he always manages to find him in the forest and spend almost the whole day with him. Not that it would bother the wolf. Even if he tried to get rid of his unwanted companion at first, before giving in. He still teased bunny and gave him the nickname Deku as a reminder of his silly act. But then said nothing about his own nickname Kacchan, that he received because bunny just couldn’t say his name right, and this was the best he could think of.
They spent years together and as they were growing up, they started to realize that it was not only friendship, what was blooming between them. But that was something their families didn’t want to hear about. Katsuki’s pack was telling him to stop seeing the green bunny. That he is supposed to find someone of his own species. He didn’t listen to them. The same as Izuku didn’t listen to similar advice he got.
Their feelings were mutual and strong, so why did everyone want to stop them so much? They never heard about a pair of prey and predator, but it was probably just because of these talks. And they were determined to stay together no matter what. They knew what they had to do. Spring was coming and with it also Izuku’s heat. It was their time and chance. No one would be able to separate once they mate.
About a week before it was supposed to start, they found a little cave hidden behind old oak in the farther corner of the forest. It was the perfect place for their first shared nest. Katsuki as an alpha was getting all the furs and other nesting materials there and Izuku as an omega was in charge of organizing, so everything was at the right place. It took him days, before he was finally satisfied with his work. Just in time.
“Do you think we have enough of everything?” Izuku asked as he placed the last bunch of berries and leaves on the floor. Heat was normally taking the whole week and they needed to have enough supplies to last without leaving anywhere. “Don’t worry, Deku. We have more that we will need.” Katsuki assured him and he was right about it. All the food and water they collected would be enough not only for one week but maybe even for two or three. He didn’t mind it though. For him as for any other alpha, nothing could be better than taking care of his soon to be mate. Before his heat, after it, or at any other time of their life.
When everything was in its place, the wolf didn’t waste any more time and laid down next to his adorable bunny in their nest, his tail slapping the floor from how fast he was wagging with it. Just from pure happiness. From Izuku’s feeling, they knew that they still had this whole evening and probably even night before it would start. This time before Izuku’s hormones will take over him, Katsuki wanted to spend only with cuddles. Close to each other, whispering sweet nonsenses into fluffy ears, and sharing light kisses.
Like that, curled under furs, with soft purring coming from omega, they fell asleep. They have already slept many times before. But now it was different. Probably because of the excitement for what was surely coming. They have never done more than cuddles and kisses. Wanted to wait for the right moment and this moment was almost there.
The next morning when Izuku woke up, he felt different, immediately knowing what was going on. Blood in his veins felt like liquid fire running under his sensitive skin and his inner thighs were uncomfortably wet with slick. But everything of that was over beaten but almost painful feeling of emptiness deep in his guts. There was no place for doubts that his heat just started. He tried to calm himself, even though he knew it was hopeless. Loud groan escaped his mouth.
Katsuki finally started waking up to the sweet and so delicious smell. Even normally Izuku smelt amazingly to him, but this was like comparing one single bloom to the whole lilac bush. Suddenly the smell was so intense and overwhelming. There was no way, it would let him think about anything else that the little needy omega laying next to him.
“Alpha…” Izuku’s voice was silent, as the burning feeling inside was getting too much to handle. But for the first time, he wasn’t alone to deal with it. He had his alpha with him. “It’s alright Deku, I got you.” Katsuki reached for a kiss. It was hot and wet and absolutely the best kiss they ever shared.
Since they went to sleep naked, there was no clothing in their way. Hands could freely move over the sensitive skin. Katsuki was already fully hard and from the press against his leg, Izuku’s cute little cocklet wasn’t any better. Katsuki moved one of his hands down and his howl met with bunny’s moan. He knew that omegas were tinny but was able to finally touch it.
After that, his fingers slid further and were met with wetness leaking from the bunny's twitching hole. It was the last thing that stripped him of all his self-control. He quickly got a smaller body under him, covering Izuku’s neck with kisses and bites, nose buried in scent gland, before he moved to his pink nipples. One teasing with his tongue and teeth, while his fingers played with the second one. Switching between them repeatedly.
Moans coming from Izuku were getting much louder, as he started to lose control over his own body in favour of his heat. But it absolutely didn't matter since Katsuki was determined to do all of the hard work by himself alone. Izuku just had to enjoy all the attention. When he was satisfied with how red and erected nipples were, he carefully spread freckled legs, so he could get to the main course.
And Katsuki would lie if he said that he didn’t like the view. Slick made the bunny's hairless hole all shiny and slippery. Long wolf tongue covered it with no problems and Katsuki groaned at the taste. It was even better than the smell alone. Without thinking, he started to lick, as he gently stroked trembling thighs around his head. Then Izuku screamed as he came and Katsuki could feel squeezing around his tongue with a large amount of the delicious liquid squirting right into his mouth. First orgasm for the bunny from many others that should have come.
Katsuki’s fluffy ears twitched when he heard Izuku’s voice, as if the orgasm made him even more needy. And well, it was expected. Bunnies were known for their stamina and this was just beginning. “Please… Alpha, please... I – Ah – I need it… Please inside!” Tears were rolling from his big, beautiful eyes. As a young and healthy wolf, Katsuki couldn’t fight it anymore. He let bunny from his grip, so he could get him on his knees and hands. Perfect mating position.
All his thoughts were shrunk to only two words that mattered at the moment. Mate and breed. His inner alpha was repeating it like some mantra and his fangs painfully ached as he watched the beauty in front of him. Head down and ass up, back arching and little soft tail raised, so it won’t be in the way of the presented hole. Presented all just for him. He couldn’t see Izuku’s face behind his long floppy ears, but just from his moans and whispers, he knew that his cute bunny wanted it as much as he did himself.
He took his pulsing cock and lined it with the dripping hole. He put only head inside and it instantly felt as if Izuku wanted to suck him inside on his own. But unfortunately, he couldn’t. So, Katsuki was sliding in slowly, inch after inch, enjoying the feeling of incredibly hot and tight walls squeezing his whole length. Another howl came from his throat as he bottomed. Izuku’s body was shaking from the pleasure and bunny pleaded for more, hands grabbing tightly the fur under him.
And Katsuki did what he was asked for. Once he was fully inside, he didn’t wait a minute and started moving. The world around them ceased to exist. All they could sense was the other's body, heavy and intensive smell of arousal in the air and an urgent need to release. Birds and other small animals near the cave were gone, scared by loud moans and screams of pleasure.
Floppy ears were hopping from every hard trust and Katsuki had to resist from grabbing them. Izuku wouldn’t be happy about it. Ears were the treasure of every bunny without exceptions, and they cared a lot about them. They were able to spend long hours just grooming them and making them perfect. If he grabbed them, it would upset his bunny and, in this situation, upsetting his omega was the last thing he would want to do.
Soon, Izuku could feel sensation on his oversensitive hole. Base of the wolf's cock was getting bigger as the knot started to form. It was getting harder to get it in and out of the rim and bunny arched his back even more at the vision of being bred. And surely, it took only a few more trusts before the knot finally caught, which led to Izuku’s second orgasm. Little bit of watery and in fact useless cum fell on the fur.
At the same time Katsuki leaned down and let his sharp fangs sink into the flesh of Izuku’s neck. Combination of his own orgasm, the sweet sounds that Izuku was producing and the feeling of mating bond forming, he felt incredible and overwhelmed. Wolf felt his balls pulsing as all of his seed was leaving his body and was filling bunny’s womb to the brim. One hand placed on his stomach, so he could feel a growing bulge from all of his fertile cum. His tail wagging fast as never behind him.
They didn’t know if Izuku would be able to bear Katsuki’s pups, since they were completely different species, they hoped so, but at that moment it didn’t matter. All felt so good, and he wished it never ended. “Good omega.” Alpha whispered. But after that, it was just silence. No answer from his mate.
Katsuki opened his eyes, not remembering when he closed them and stared. Stared at a deep ugly wound on the back of bunny’s neck that he did with his teeth, and where was still appearing new blood. Izuku wasn’t moving and the dark red puddle under them was getting bigger and bigger, soaking into furs. His knot deflated almost instantly from the shock and slipped out. With shaking hands he turned the bunny on his back. Izuku’s big eyes were full of tears, without any sign of life.
Two wet paths were running over the wolf's pale cheeks. Only at that moment he realized it. Realized why everyone tried to stop them. Why everyone was telling them, it was a bad idea for predator and prey to be together. To mate. Izuku’s body was too small, too delicate to withstand the grip of his jaw. But it was too late. His precious bunny in his arms was losing too much blood to have any chance to survive, not to mention that his spine was most likely injured too.
Katsuki cried, hugging his dead lover as close to his chest as he could, not caring about fresh blood covering him. Then he raised his head, ears flat against his scalp, and howled loudly. All his pain and sadness could be heard in his voice. And for a few more days, all animals living in the area could hear the loud heartbroken howling of the wolf who killed his love. Until one morning there was silence.