When Izuku woke up, he felt disoriented and groggy.

As always, he didn't remember what had happened when he was in heat. He slowly flickered his emerald eyes open, a soft hum escaping his pink lips as he did, when he unexpectedly recognised the scenery's of Katsuki's room around him. He frowned, wondering what he was doing in Katsuki's bed, before quickly forgetting all about his interrogations as soon as he registered the warmth of a body next to him.

"Kacchan..." He turned around to nuzzle Katsuki's chest, a purr starting to leave his lips, when Katsuki suddenly stopped him.

"Don't."

Izuku froze at the words, his body tensing up and his heart instinctively clenching inside his chest. He had never heard Katsuki's voice sound like this before, at least not directed to him. The alpha's tone was cold and harsh, void of any form of affection.

"What..?" Izuku stammered. He didn't understand why Katsuki was suddenly pushing him away. "What is it?" He hesitantly asked, his big green eyes meeting crimson orbs filled with unexpected anger.

"Try to fucking remember, for once." Katsuki bluntly replied. The rage inside his voice was clear as day and Izuku instantly stiffened at the sound of it.

"D-did something happened..? Did I go into heat again..?" The omega tentatively murmured as he tried to remember what had happened. He could only deduce the fact he had gone into heat. It was the only explanation to why he was in Katsuki's bed but didn't remember when nor how it happened. He tried to think about what he had been doing before everything went black but his memories were all over the place, another clue indicating he had surely gone into heat...

That's when it suddenly hit him. "I was with Sero..!" Izuku exclaimed, the distinct memory of the dark haired alpha trying to kiss him just before his heat had came striking him. "D-don't tell me..." He stuttered, his voice trembling and dread quickly swelling inside him as he fearfully looked at Katsuki.

"I found you naked on all fours beneath the fucking bastard." Katsuki spat out. The amount of wrath and venom inside his words was simply unmeasurable. "You were moaning and asking for it like a fucking slut."

"W-what?" Izuku's entire world suddenly fell apart at the words. His breath caught inside his throat and his heart stopped to beat, utter anguish taking over him. "You're lying..." He could only murmur as unbearable distress grew inside him.

"Hah? And why the fuck would I lie for this shit?!" Katsuki suddenly yelled and Izuku violently flinched in response. The tiny omega just couldn't help it. "I-I..." He tried to speak but was unable to as a lump formed inside his throat, tears inevitably welling up in his emerald eyes.

"Fuck." Katsuki immediately regretted his burst of anger. "No, don't cry." He grunted as he saw tears start to roll down Izuku's cheeks, the sight deeply breaking his heart. "I shouldn't have yelled. Don't fucking cry, Deku." He couldn't resist pulling Izuku into his arms and holding the omega close to him, his rage quickly forgotten as Izuku's sobs painfully tore at his heart's strings.

Izuku's whole body was shaking. "D-did we...?" The omega asked between hiccups, imagining the worst and wanting to die at the only thought of it. It couldn't be. There was no way he had slept with Sero, right? It just wasn't possible.

"No. I arrived in time." Katsuki said and Izuku felt like he could suddenly breath again, intense relief washing over him. "I don't know what the fuck happened before I came but he didn't put it in." But then Katsuki added and Izuku's whole world crumbled all over again.

"Y-you don't know what happened b-before you arrived..?" He stammered, his emerald eyes wide with fear and his stomach painfully clenching in utter dread. Tremors started to travel his entire body as uncontrollable sobs broke past his lips, pain beyond words swelling inside him.

"Hey, no. Look at me, Deku." Katsuki quickly took Izuku's face into his hands. He could see the complete panic and absolute sorrow inside the omega's emerald eyes and felt his own heart break at the sight.

"I-I'm sorry, Kacchan..." Izuku hiccuped between sobs. "I-I'm so sorry... I-I let another alpha t-touch me..." He brokenly apologised as heavy tears rolled down his freckled cheeks. He felt so ashamed it was suffocating him.

"Don't fucking say that, you didn't do shit!" Katsuki angrily replied. He had never seen Izuku look so broken before and it was scaring the fuck out of him. "It ain't your damn fault! Nothing fucking is!"

Even thought he had been angry at first and had taken it out on Izuku, Katsuki didn't think any of what had happened was Izuku's fault at all. How could it be when the omega wasn't even conscious of what he was doing when in heat?

"This bastard took fucking advantage of you, is what happened!" Katsuki growled out. He was already burning with intense rage and hearing Izuku's heart-wrenching sobs was only enhancing his utter wrath. He was starting to regret having spared Sero's pathetic life when the only thing the other alpha deserved was to die.

"B-but you said I asked f-for it..." Izuku sobbed and Katsuki really wished he hadn't said any of the things he had just blurted out under the influence of anger minutes ago.

"I didn't mean it. I know the way you are in heat can't be fucking helped." He assured but Izuku was absolutely unconsolable. The omega couldn't stop crying and shaking. He felt so dirty as he kept imagining Sero's hands touching his body, his heart aching inside his chest and his sorrow completely submerging him.

"I-I betrayed you..." He murmured in the most heart-breaking voice anyone could ever have.

Katsuki couldn't take it. "You didn't." He strongly declared, his hands firmly holding Izuku's face in place so that the omega would look at him. "Listen to me, Deku. You did nothing wrong." He assured as he gazed right into Izuku's emerald eyes. They were red and filled with tears, but nonetheless breathtakingly beautiful. Katsuki couldn't look away from them.

"I'm sorry I yelled at you." He said in a much calmer voice. He would never get Izuku to relax if he kept shouting. He needed to calm things down and to reassure his omega. "You're not the one I'm angry at, I promise." He murmured as he gently wiped Izuku's tears away with his thumbs, releasing soothing pheromones in the air as he did.

Izuku felt his whole being instinctively relax at his alpha's scent. His respiration started to get slower, the tremors running up and down his body progressively fading away. The panic he was feeling seconds ago slowly disappeared and a feeling of intense safety instead set inside him.

Everything was fine as long as he was in Katsuki's arms. Nothing too serious had happened with Sero and it was the only thing that mattered. Katsuki had arrived in time. He had protected him...

At least he did this time. But what about the next time?

"Kacchan..." Izuku timidly called and Katsuki hummed in response. "What is it, kitten?" The affective pet name caused Izuku's heart to melt and his stomach to erupt with butterflies, but the omega stayed calm as he gathered his courage to pronounce his next words.

"I want to do it with you." He confessed in a silent whisper.

Katsuki clearly wasn't expecting this. "What?" He asked in disbelief, his crimson eyes searching for Izuku's gaze to try and understand what the omega had just said. He wasn't even sure he had heard Izuku right and, if he did, surely Izuku hadn't meant what Katsuki was thinking about... but Izuku's following words instantly erased any doubt he could have.

"I want my first time to be with you, not with anyone else." The omega murmured in a timid but nevertheless confident voice.

He wanted to give his virginity to Katsuki. It was something special for him, something he only wanted to give to someone he loved. He would never forgive himself if something like today happened again and that this time things would go too far. Izuku had already decided his first time would be with Katsuki since long ago, and the only thought of sleeping with someone else when he was in heat without even being conscious about it was terrifying him...

"Right now..?" Katsuki could see in Izuku's emerald eyes how serious the omega was, and words weren't even enough to express what he was feeling right now. Hearing Izuku say he wanted his first time to be with him meant so much to Katsuki. It was such an honour.

"Yes, I don't want to take any risk. It has to be you and no-one else." Izuku answered in a soft whisper. With how things had been going between them, it would have happened at one moment or another anyway. They had already done so much together and taking the next step had only been a question of time.

"Are you sure?" Katsuki asked one more time, just in case. Their first time together was a big deal. They would fully connect and Katsuki wanted to be sure it really was what Izuku wanted.

"Yes." Izuku responded without hesitation. "Please, Kacchan..." He looked right into Katsuki's eyes as he pleaded, beautiful green eyes locking with captivating crimson orbs.

Katsuki only waited some instant before cupping Izuku's face and pressing the most loving, tender and sweetest kiss on the omega's pink lips. It was so soft and gentle it took Izuku's breath away. Then, he caressed Izuku's cheeks and seductively murmured.

"Okay. Let's do it, kitten."