"You were so fucking hot, back there." Katsuki said as he pinned Izuku against the door of his bedroom. They were back in the dorms, the atmosphere around them filled with electricity and arousing pheromones. "I swear I almost got a boner just looking at you."

"Really?" Izuku almost moaned at Katsuki's words. Knowing he had such an effect on Katsuki was turning him on so much. The way Katsuki was looking at him right now, full of desire, was so hot it was making his whole body heat up.

"Yeah. I want to mark you so bad. Can't wait until you're finally all mine." Katsuki husked out between kisses on Izuku's neck. He wanted to claim Izuku his so bad it hurt. What he would do just to sink his fangs on Izuku's scent glands...

"Then, what are you waiting for?" Izuku asked, his words instantly causing Katsuki to look up. Crimson orbs stared into emerald eyes, the tension in the air growing as their lust for each other kept enhancing.

"We have to wait until your next heat." Katsuki whispered. An omega could only be marked when in heat, it was how things worked. If it was up to him, Katsuki would have already bit Izuku long ago, the second right after he had just had the omega's authorisation to do so. But he couldn't and instead had to wait until Izuku's next heat arrived. The wait was going to be even harder as nobody knew when Izuku's next heat was going to hit.

"I don't want to." Izuku unexpectedly stated and Katsuki frowned. "Don't want what?"

"I never remember what happens when I'm in heat. I don't want to forget the moment when you'll mark me..." Izuku said in a murmur, his gaze almost sad as the words left his lips.

Being marked only happened once in an omega's life. It was a special and incredibly important event, even more important than a marriage as it bonded a pair together for life with no turn back possible. Not being able to remember such a magic moment was extremely upsetting for Izuku. He didn't want to forget the day Katsuki would claim him forever, it was unfair.

Katsuki understood Izuku's frustration perfectly. He would hate it too if he was the one that couldn't remember. Actually, he had already thought about it and even tried to find a solution. Since marking could only be done when the omega was in heat, this couldn't be avoided, there was only one thing they could do.

"What if I put you into heat?"

Izuku's emerald eyes widened in surprise at Katsuki's words. He clearly hadn't expected this but, technically, it could work. A natural heat and an induced heat didn't work in the exact same way, the hormones involved weren't the same. However, they had no way to know if it would enable Izuku to remember what would happen when he was in heat, but it was their best shot, if not the only one.

"You can do that?" Izuku asked unsure. As a dominant alpha, it was true Katsuki had really strong pheromones, but it took a lot to put an omega into heat.

"I can try." Katsuki answered with a smirk. He was actually confident in his capability of driving Izuku insane enough to put him into heat, and was even more motivated to do so as it meant he could mark the omega sooner.

He went to sit on their bed and pulled Izuku on his lap, his crimson eyes locked with Izuku's emerald irises as he pronounced his next words in a seductive murmur:

"Tell me what turns you on."

"O-oh." Izuku felt his whole body go warm and his belly erupt with flutters in response. He inevitably blushed, his cheeks turning an adorable rosy shade as words refused to leave his pink lips.

Katsuki almost laughed at Izuku's timidity. It was so cute to see Izuku could still get embarrassed when they had already done everything that could be done together. "Come on. Don't get shy on me now, Deku." He teased, his voice still purposely low and sexy.

"I like your body..." Izuku said the first thing that came to his mind. He couldn't deny Katsuki was incredibly handsome, and the way he was built was so attractive Izuku always felt himself get wet at the sight of Katsuki's perfect muscles.

"Yeah? You want me to strip?" Katsuki smirked as he removed his shirt, leaving his well-defined pecks and abs bare. He saw how Izuku looked at his chest and felt pleased that his omega liked the way he looked, pride swelling inside him when Izuku used his hands to softly trace the shape of his muscles.

"I love how muscular you are. It's so sexy." Izuku breathed out as if in a trance. Having a strong alpha that looked this powerful was such a turn-on for him.

"What else?" Katsuki asked lowly, his gaze never leaving Izuku's pretty face.

Izuku looked up from Katsuki's chest and almost gasped at the intensity with which Katsuki looked at him. "I like your eyes, and the way you look at me..." He whispered as he lost himself into Katsuki's captivating red orbs.

"And how do I look at you?" Katsuki couldn't resist asking even so he perfectly knew how he looked at Izuku.

"Like you want to devour me." Izuku answered breathlessly. Katsuki was starting to release arousing pheromones in the air and, even if it still was a small amount, it was affecting Izuku greatly. "Like I'm your everything..."

"You are my everything, kitten." Katsuki seductively purred and Izuku shamelessly moaned at the way the affective pet name rolled off Katsuki's tongue. "I love it when you call me kitten." He said as Katsuki made him lay on the bed, his shirt being pulled off his body and leaving him bare chested. "And when you whisper into my ear..."

"Yeah? You like that?" Katsuki murmured while licking behind Izuku's ear, his low voice causing delicious shivers to run down Izuku's spine. Hovering over Izuku, Katsuki slowly removed Izuku's pants and underwear in turn, growling appreciatively at the sight of his omega's now naked body under his eyes. "What else, kitten?" He gently nibbled Izuku's earlobe.

"When you talk dirty to me..." Izuku confessed in a whisper. Katsuki kept releasing more and more pheromones progressively and Izuku was slowly losing his mind. Telling Katsuki what was turning him on was only enhancing his arousal, his whole body feeling incredibly hot as slick kept leaking out of his entrance.

"Really? You want me to tell you how wet you are?" Katsuki murmured in a deep husky voice. He brought his hands between Izuku's milky thighs and softly caressed the omega's most intimate part, circling his fingers around the pink opening. "How you're dripping with slick just for me?" He cautiously sank two of his digits inside Izuku's tight heat.

"Ngh..." Izuku let out an adorable whimper at the delicious intrusion. He closed his emerald eyes and arched his back, loving the feeling of Katsuki's fingers stroking his sensitive inner walls. It felt so good he fisted the sheets around his head, lewd moans escaping his pink lips each time Katsuki hit his prostate. "Anwh, Kacchan..!"

"Look at how you're sucking my fingers in." Katsuki wasn't taking his eyes off of Izuku's blissful face. He found Izuku so beautiful when he was being pleasured. He could tell the omega was close to go into heat by the way his body kept warming up more and more, and so he decided to release all the arousing pheromones he could at the same time, his scent completely overpowering the whole room.

"You're so tight and soft, kitten." He murmured sexily right into Izuku's ear. "You have no damn idea how fucking good you feel around my cock."

Izuku couldn't take it anymore. "Kacchan..!" He suddenly moaned loudly, his entire being swelling with burning warmth as his own arousing pheromones started to fill up the air. "Oh god, please! I need you!" He shamelessly begged, his intense need to finally feel Katsuki inside him completely overwhelming him.

"Looks like it worked." Katsuki smirked in triumph. He could recognise Izuku's heat pheromones easily, the way the omega's whole body felt hot and looked flushed enough indication to know Izuku was finally in heat.

"Ngh..!" Izuku moaned as Katsuki pulled his fingers out of him. He felt so sensitive and aroused right now it almost was enough to make him come. The sight of Katsuki removing his pants and taking his throbbing cock inside his hand triggered more slick to drip down his thighs, his hole desperately clenching around nothing in need.

"W-what if I still don't remember what happens..?" He couldn't help but ask even in his utter state of arousal.

"You will. You call me alpha when you're unconscious." Katsuki answered as he leaned over Izuku. Taking one of the omega's legs in his hand, he pushed it against his chest to have better access to his dripping hole, before gently nudging the pink entrance with the head of his dick.

"I-I do.?" Izuku managed to inquire between the adorable whimpers that escaped his lips at the sensation. He wanted Katsuki inside him so bad it hurt. He had never felt the need to be penetrated with such intensity before, it was driving him crazy.

"Yeah." Katsuki amusingly answered as he put languorous kisses all over Izuku's neck. Of course Izuku didn't remember calling him alpha when in heat.

"And you like it..?" Izuku asked and Katsuki locked eyes with him, his crimson eyes intensely boring into Izuku's pools of green. "I do. But I prefer when you're aware of who is pleasuring you." He seductively murmured just before putting the sweetest kiss on Izuku's lips.

"Kacchan." Izuku breathlessly called out. He couldn't possibly wait any longer. He needed Katsuki like he needed to breath. "I want you! Now, please..!" He completely gave in to his heat, his whole body quivering as he shamelessly begged for Katsuki to take him.

"Nghhh!" He let out the loudest moan ever when Katsuki finally sank his whole length inside him in only one long thrust, the sensation to be completely filled by his alpha this suddenly when he was in such an aroused state enough to abruptly send him over the edge. Milky cum spurted over his belly as all of his body trembled, his back arching up and his insides twitching around Katsuki's cock while he kept coming.

"Fuck." Katsuki stared at the sight breathlessly. The way Izuku had just came undone so suddenly had been so beautiful he had almost erupted himself. "Did you just come with only me putting it in?" He felt pride swell inside his chest as he put sultry kisses all over Izuku's face, his cock throbbing with the need to reduce Izuku to a mindless moaning mess.

"That's so damn hot. You're driving me fucking crazy." He husked out just before starting to thrust inside Izuku.

"K-kacchan, wait!" Izuku whimpered loudly in response. He hadn't recovered from his sudden orgasm yet and already feeling Katsuki move inside him felt incredibly overwhelming. His inner walls felt even more sensitive than usual, the way Katsuki's whole length dragged along them triggering pure bliss to take over him.

"Nghh! Oh god!" He kept moaning as he tightly held on to Katsuki, his legs wrapped around Katsuki's waist as tears of pleasure rolled down his cheeks.

"You're so warm, kitten. So damn warm." Katsuki couldn't get enough of Izuku's tight heat squeezing around his pulsing cock. It was their first time doing it when Izuku was in heat and his insides felt way hotter than normally. Katsuki loved it so much he increased the pace of his thrusts even more, low groans leaving his lips each time Izuku tightened around him.

"S-so deep! Feels so good.!" Izuku mewled relentlessly and Katsuki cursed under his breath. "Fuck. I won't last long if you keep clenching around me like this." He said as he suddenly pulled out of Izuku and flipped him around, raising Izuku's hips before thrusting back inside him all the way in.

"Anwh! Here!" Izuku almost cried out. With his ass in the air and his face pressed against the mattress, he had the perfect position for Katsuki's cock to reach his prostate perfectly.

"Here?" Katsuki husked out as he bucked his hips right as he had just done. He set a rather rapid pace of deep pleasurable thrusts, each time hitting Izuku's sweet spot and driving the omega insane with pure bliss.

"Yes! Mwh, oh god!" Izuku couldn't think at all anymore. Only the intense pleasure he was being provided with right now mattered, and the low groans Katsuki was letting out right next to his ear. He felt something warm lick at his scent glands and whimpered in delight, his whole being quivering with anticipation.

"Do it, Kacchan..!" He exclaimed breathlessly. He knew what was going to happen and wanted nothing more than to finally feel Katsuki's fangs sink into his nape, claiming him whole. He felt like he had waited his whole life for this, right from the first time he had ever laid eyes on Katsuki.

"You're sure?" Katsuki asked one last time for Izuku's consent. It was too big of deal to mess it up. He needed to be sure it really was what Izuku wanted.

"Yes, bite me!" But he didn't have to worry as Izuku gave him clear affirmation, his fangs sinking into Izuku's scent glands as soon as the words left the omega's lips, breaking the skin and marking Izuku his forever.

"Nghhh!!" Izuku couldn't possibly hold back anymore. The feeling of Katsuki's alpha venom flowing into his blood was so intense it made him reach his climax abruptly, his entire body trembling uncontrollably as the most powerful orgasm he ever had took over him. Being finally claimed by Katsuki was like nothing he ever felt, all the emotions and sensations he felt at this moment were simply beyond words.

He just knew it felt right, incredibly right, as if it was meant to be.

The way Izuku's inner walls twitched spasmodically around Katsuki's cock felt so good Katsuki couldn't possibly contain his own orgasm any longer. With his fangs still buried deep into Izuku's scent glands, he came in turn with a deep growl, spilling inside Izuku and filling the omega up with his load.

He held Izuku close to him as they both took time to recover from the intensity of their orgasm, their body still quivering in pleasure as they breathed heavily. Katsuki eventually removed his fangs from Izuku's scent glands, slowly, before gently licking the wound he had made. Seeing his mark on Izuku's nape made his chest swell with overwhelming emotions; pride, love and utter devotion.

"I love you, Izuku." He murmured lowly as he pressed the softest kiss on Izuku's scent glands, as if it was his greatest treasure.

"So fucking much." He added full of surging emotions. Slowly, he pulled out of Izuku and gently made the omega roll on his back, before capturing Izuku's lips with his in the most loving kiss ever, so sweet it made Izuku's entire belly erupt with flutters.

"I swear I'll make you happy all your life." Katsuki promised, his crimson orbs boring into Izuku's beautiful emerald eyes.

"I know." Izuku answered in a whisper. He looked at Katsuki lovingly as a soft smile grazed his lips, his arms moving on their own and wrapping themselves around Katsuki's neck to pull his alpha into another passionate kiss.

Katsuki was his reason to live just as he was Katsuki's, and Izuku knew nothing could ever tear them apart.

Unstable Heats is unfortunately over. Thank you so much to everyone who took the time to read it until the end, your support means so much to me!

As always, it is really hard to finish a story, both for me and for you, that's why I already started a new story. It's called Fake Alpha and the first chapter is already out ;)

I hope you'll keep following me as I still have a lot of ideas for several other stories. Also, remember that you can become my patron if you want to help me pay for my studies. It would give you access to numerous advantages such as exclusive stories, extra chapters, early updates and voting polls (the link is on my profile)!

I wish all the best