"Come here, kitten. I'll prep you." Katsuki said as he patted his lap, his words making Izuku's heart nervously jump inside his chest.

The omega surely was already quite loosen up with what had happened in the changing room's shower only moments ago, but Katsuki didn't want to take any risk. He'd rather finger Izuku again just to make sure he wouldn't hurt him.

Izuku gulped before timidly crawling toward Katsuki, his freckled cheeks a dark red as he started to straddle his alpha's lap. "Like this." Katsuki instructed so that the omega's back was against his strong chest and the position made Izuku blush even more, the fact he couldn't see Katsuki's face unexpectedly making him really nervous.

"Let's remove your underwear, hm?" Katsuki seductively murmured in his low, husky voice right next to Izuku's ear, before slowly slipping his hands under the hem of Izuku's boxers. Izuku helped by raising his hips, his heart racing as Katsuki smoothly slid his underwear off his legs, leaving him completely naked.

"Spread your legs." Katsuki whispered again and Izuku timidly obeyed, his heartbeats never slowing down. He didn't know why but hearing Katsuki murmur him what to do in such a sexy voice was turning him on so much. It was making him nervous and incredibly hot.

"Ngh..." Katsuki cautiously slipped two fingers inside him and a sensual whimper escaped Izuku's pink lips at the sensation. "Kacchan..." He moaned and shuddered as Katsuki slowly started to thrust his fingers inside him, his body's slightly jumping when the warm digits found his prostate. "Mwh..!" He threw his head back on Katsuki's shoulders in response and let his emerald eyes close in pleasure.

"I love hearing your sweet mewls, kitten." Katsuki seductively whispered into Izuku's ear as he kept fingering the omega. His own cock was hard and throbbing under Izuku's ass, begging to get out of his boxers and to finally enter Izuku's tight channel. "I'm adding a third finger." He warned just before slipping another digit inside the tiny omega.

"Ngh..!" Izuku let out a loud whimper in response. Katsuki usually only used two fingers to pleasure him so the intrusion caused his inner walls to stretch, the sensation foreign and unfamiliar. It wasn't particularly painful but quite overwhelming, the fullness Izuku was feeling making him want even more.

"I-It's okay already, Kacchan..." He said between adorable moans. He didn't want to wait anymore. He wanted the real thing.

"Just a little more." Katsuki answered. As much as he wanted to put it in already, he needed to make sure Izuku was ready to take the size of his cock. So he continued to stretch the omega out, doing scissors motions with his fingers, until Izuku became a crying and whimpering mess. "Kacchan, please..!" The omega shamelessly begged.

"Sorry. It should be fine, now." Katsuki finally pulled his fingers out of Izuku before putting a sweet kiss on the smaller boy's cheek to apologise. He then gently turned Izuku around on his lap so that they could look at each other, his hand moving to tuck a green curl behind Izuku's ear.

"How do you want to do it?" He asked in his low, deep voice while gazing right into Izuku's emerald eyes.

Izuku felt his whole face heat up at the question. It was really happening. They were going to fully connect for the first time and the myriad of emotions swirling inside the omega was beyond words. "Facing each other..." He timidly answered in a mere whisper.

Katsuki smiled in response. "Of course." He slowly laid Izuku down on the mattress and placed himself on top of the tiny omega, his hands at each sides of Izuku's head. The moment was incredibly intimate as they locked eyes together. At this instant, they were the only thing that mattered in the whole world.

"Do we need condoms?" Katsuki asked in a murmur. He had bought some just in case, knowing their relationship would surely arrive at this point soon, but didn't know if Izuku wanted to use them or not. Since they had never done anything with someone other than them, their only concern was not to get Izuku pregnant.

"No..." Izuku unexpectedly answered. "I'm not in heat... and the suppressors I take work like a pill..." He confessed with a soft blush on his freckled cheeks, his heart still racing inside his chest. Truth was he wanted to feel Katsuki without anything between them. He wanted to be able to tell the exact shape of his alpha and to feel his warmth inside him.

Katsuki smirked. He didn't need to hear it to know what Izuku was thinking. So he sat up on the bed and finally removed his boxers-brief, his hardened cock springing up against his abs. He looked right into Izuku's eyes as he took his length inside his hand and stroked it a few time, precum leaking from his tip, before placing himself back on top of the omega.

Izuku gulped as he timidly wrapped his arms around Katsuki's neck. He was so nervous he felt like his heart was going to burst out of his chest. He just couldn't help it. It was his first time and Katsuki was by no means small. Izuku wasn't sure it would even fit and was scared it would hurt.

Katsuki surely noticed the tiny omega's nerves because he pressed a soft kiss on top of Izuku's head. "You know we can still stop whenever you want." He offered. As much as he really wanted to finally make love to Izuku, he didn't want his omega to feel forced to do anything.

Izuku looked at Katsuki with love and adoration inside his emerald eyes in response. The fact Katsuki was ready to stop everything just for him meant so much, and that's exactly why Izuku wanted his first time to be with Katsuki. Because he trusted his alpha more than anything.

"I want to do it..." The tiny omega whispered. His voice was still slightly wavering and nervous, but Katsuki could tell Izuku meant each of his words.

"Don't worry, I'll be gentle." Katsuki murmured in his usual seductive voice that always send shivers down Izuku's spine. He grabbed one of Izuku's legs and gently pushed it up against the omega's chest, facilitating the access to Izuku's entrance. He then guided his cock toward the pink hole and softly nudged Izuku's opening with the head of his dick, wanting to get Izuku used to the feeling first, his crimson orbs never leaving Izuku's emerald eyes as he did.

Izuku's breathing hitched at the action. The sensation of Katsuki's cock gently rubbing his entrance felt incredibly intimate and arousing. Katsuki was giving him time to relax and Izuku really was grateful. "Ngh..." A small whimper escaped his lips as more slick leaked from his opening, his whole body feeling incredibly hot and warm.

"You okay?" Katsuki asked lowly and Izuku timidly nodded. "Yes..." He trusted Katsuki. He wanted to do this with his alpha and no-one else.

"Can I put it in?" Katsuki asked again in a murmur, his words causing Izuku's stomach to do somersaults. The omega's cheeks turned a dark red and warmth took over his whole being, his heart racing as he slowly nodded his head yes.

Katsuki felt his own heart pound inside his chest as he spread Izuku's legs slightly wider. He positioned the head of his cock right against Izuku's entrance and began to push in, slowly, when Izuku suddenly stopped him.

"Wait, Kacchan."

Katsuki immediately stopped what he was doing and looked up at Izuku, expecting to see panic inside the omega's emerald eyes, but instead finding an expression of bashfulness and something he couldn't discern on Izuku's pretty face.

"I want you to say it..." Izuku timidly whispered as an adorable blush spread on his freckled cheeks.

Katsuki was about to ask Izuku what he meant by this when realisation hit him, a sexy smirk taking over his features at the sight of Izuku's shy expression. He brought a hand to Izuku's face and gently brushed his thumb against the omega's cheek, making sure they were gazing into each other eyes, before seductively murmuring.

"I love you, Izuku."

Izuku's heart momentarily stopped to beat at the words. He already knew Katsuki loved him, but they had never confessed their feeling to each other aloud and hearing Katsuki pronounce these three words meant so much to Izuku. The omega couldn't even describe the turmoil of emotions swirling inside him at this instant, and the fact Katsuki had used his given name to confess was making things even more meaningful.

"Again..." Izuku asked and Katsuki didn't even hesitate before doing so. "I love you so fucking much. You're the only one for me, Izuku." He repeated with so much honesty and adoration inside his crimson eyes that Izuku felt his heart completely melt.

"Me too. I love you more than anything else, Kacchan." The omega whispered, tears shining inside his emerald eyes, and Katsuki slowly leaned in to press their lips firmly together.

They kissed like they never did before, with so much passion and ardor they both became breathless, their tongues dancing together and their heartbeats mingling together. When they came up for air, they locked eyes, crimson orbs staring into emerald eyes as Katsuki slowly began to push his length into Izuku.

Izuku slightly tensed up at the intrusion, a small wince escaping his pink lips when the tip of Katsuki's cock pushed past his tight ring of muscles.

"Shh. Stay relaxed, kitten. Take deep breaths." Katsuki gently comforted the omega. The first time often hurt, it was normal, but Katsuki wanted the experience to be as painless as possible for Izuku. He began to release soothing pheromones as he gently caressed Izuku's hips, trying to get the omega to relax, while Izuku focused on taking deep breaths.

"That's it. You're doing good." Katsuki pressed a loving kiss on top of Izuku's forehead. The head of his cock was now completely engulfed inside Izuku's tight heat and so Katsuki continued to slowly push the rest of his length inside the omega, watching with fascination as more of his cock progressively disappeared into Izuku.

"I-is it all in yet..?" Izuku asked between quiet whines. Katsuki's cock definitely felt bigger than three fingers inside him. The omega could feel his inner walls stretch to accommodate the size of his alpha and the sensation certainly wasn't agreeable.

"No, only halfway." Katsuki answered and Izuku's heart skipped a beat, his breathing hitching. "You're lying..." The omega whispered. He already felt so full and couldn't believe Katsuki still hadn't sank all of his length inside him.

Katsuki couldn't contain an amused smirk at Izuku's expression. "I'm not." He assured as he began to place sultry kisses on Izuku's neck, doing his best to keep his omega relaxed while he continued to slowly enter him, inch by inch, until he finally was deep inside Izuku.

"Here, it's all in." He husked out in a voice that was closer to a groan. Izuku's inner walls were clenching so tightly around his cock he was afraid he was going to come right then and there. Katsuki had never felt anything like this before. "You're so damn tight and warm." He breathed out as he stayed still to let Izuku adjust to his size.

Izuku felt like Katsuki's cock was pressing against his stomach and filling up all of him. It was a rather strange and painful feeling, one he couldn't even describe. But, above anything else, the only thing he could think about was the fact they finally were fully connected.

"Oh god, you're really inside me..." He murmured in disbelief, his heart racing and his body heating up.

"Fuck, don't tighten up even more." Katsuki groaned as Izuku's insides tightened around his cock. The pressure felt absolutely amazing and was making it extremely hard for him to hold back. "S-sorry..." Izuku timidly apologised before letting out a small wince when Katsuki slightly moved inside him.

"Does it hurt?" Katsuki immediately asked. He could see the sweat glistening on Izuku's forehead and the way the omega was breathing more heavily than usual, as well as the tears that were threatening to roll down his freckled cheeks.

"A little..." Izuku admitted in a whisper. He didn't want to worry Katsuki but it did hurt. However, it was nothing he couldn't bear.

"You think I can move?" Katsuki hesitantly asked in a low, husky voice. He was dying to just move already but was using all of his self-restraint to let Izuku some more time to adjust. He knew it probably was hard for the tiny omega to accommodate to the size of his length. After all, it was Izuku's first time and losing his virginity to a dominant alpha had to be extremely hard on his small body.

"Slowly, please..." Izuku answered with an adorable blush covering his pretty face and Katsuki felt his heart pound faster in response. Izuku was allowing him to claim him whole, body and soul.

"Of course." Katsuki murmured before slowly starting to move, the alpha tentatively sliding his cock almost all the way out before smoothly thrusting it back inside. "Fuck..." A low curse escaped his lips at the divine sensation, the feeling of Izuku's tight and warm heat being pure bliss around his throbbing cock.

"You feel fucking amazing." He husked out between quiet groans of pleasure. "It's so soft, inside you." He set a slow rhythm of long and deep thrusts, his face buried into Izuku's neck and his lips covering the omega's skin with small love marks.

"K-kacchan..." Izuku called out in a shaky moan. He was hugging Katsuki's broad shoulders for dear life, his emerald eyes closed as Katsuki's cock kept rubbing against his sensitive walls. The sensation was foreign and overwhelming, like nothing he had ever felt until now.

Katsuki raised his head to look at Izuku's beautiful face. "You okay, kitten?" He asked, his voice incredibly gentle and filled with love.

Izuku's heart melted at the sound of it. He opened his emerald eyes and gazed into Katsuki's captivating red orbs, emotions without words swelling inside him. "Yes, I'm okay..." Katsuki's slow movements were rather painful as Izuku wasn't used to this yet, but he didn't care. Seeing Katsuki feel good was way more important. Being connected together was the only thing that mattered.

"Tell me if it's too much, I'll go even slower." Katsuki said even so he was dying to increase the pace of his thrusts. It was taking him everything he had to keep a slow rhythm, but he didn't want to take any risk to hurt Izuku.

"No, it's fine..." The omega answered between small whimpers, some due to pain and other to pleasure. Feeling Katsuki's warm cock rub against his inner walls was strange but mind-blowing. It hurt and felt good at the same time, driving him crazy. "Ngh..." A low moan escaped his pink lips as Katsuki's length brushed close to his prostate, his back sensually arching up at the sensation.

"You're so fucking pretty, kitten." Katsuki breathed out at the sight. He was entranced by Izuku's blissful expression. He found the way the omega's face was flushed and his emerald eyes half-lidded by lust absolutely beautiful. Katsuki couldn't get enough of it.

"Look at me." He seductively murmured as he caressed Izuku's cheek with his thumb, pressing a soft kiss on the omega's irresistible lips before staring right into his big green eyes. "I really love you, Izuku." He confessed once again.

Izuku's heart skipped a beat at the words and his insides unconsciously tightened around Katsuki's cock in response. It caused Katsuki to let out a low growl at the sensation, the alpha using all of his control to not come right this instant.

"Fuck, I'm not gonna last long." He cursed under his breath. It was also his first time and Izuku's insides felt divinely good. They were so warm and tight around his throbbing cock. "I'm already close." He grunted as he felt his climax approach.

"It's okay, you can come inside me..." Izuku timidly answered, an adorable blush covering his freckled cheeks, when Katsuki's large hand suddenly closed around his member. "Ngh..!" The tiny omega threw his head back on the bed and arched his back at the sensation, a loud moan leaving his lips as Katsuki began to jerk him off.

"Not before I make you come." Katsuki stated in his low, deep voice. There was no way he would come on his own without giving Izuku an orgasm as well. Pleasuring his omega was the most important and Katsuki was going to make sure to drive Izuku over the edge before reaching his own climax.

"Hold me tight, kitten." He husked out just before speeding up the pace of his thrusts, his cock hitting deep inside Izuku and driving the tiny omega crazy. At the same time he kept stroking Izuku's member, precum already leaving the pink tip and leaking on Izuku's belly.

"Kacchan! Mwh..!" Izuku called out between lewd moans. He tightly held on to Katsuki's broad shoulders as he felt warmth start to build up inside his stomach, his head spinning and tears beginning to well up inside his emerald eyes. What Katsuki was doing to him felt too intense, too overwhelming and too amazing. It was painful but so pleasurable and Izuku just couldn't hold back.

"I-I'm coming..!" He whimpered just before reaching his climax, his whole body quivering and tears rolling down his cheeks at the strength of his orgasm. "Ngwhh!" A loud beautiful moan escaped his parted lips and milky cum spurted out on his belly, his insides clenching and twitching around Katsuki's pulsing cock as he came.

"Fuck, me too" Katsuki only had time to warn before a loud growl left his lips and his cock spasmed, the alpha releasing his load deep inside Izuku. Waves of warm cum filled the omega up to the brim, the sensation of being full with Katsuki's semen being strange but feeling unexpectedly deeply satisfying for Izuku.

Katsuki kept thrusting a few more times inside Izuku before stopping and burying his head in the omega's neck. He was panting and sweating, like Izuku, the two of them taking some time to recover their breath. Katsuki held Izuku close to him and the omega could only melt into his alpha's warm embrace, his emerald eyes closing in pure contentment as he bathed into the after glow of his orgasm.

He and Katsuki had just made love for the first time. It had felt amazing and Izuku still couldn't believe it had really happened. The amount of love he felt for Katsuki at this instant was so big it just wasn't quantifiable...

Izuku had never felt happier in his life than right now, in Katsuki's arms and fully connected with his alpha.

I hope you enjoyed this long and important chapter, don't hesitate to tell me your thoughts!

You can find an extra chapter on my patreon about their morning after their first time. It's named Shower Sex, so I'm sure you can guess what will happen in addition to some after care... the link is on my profile ;)

Also, remember than in real life you should always use protection when having sex. I know I didn't make Katsuki and Izuku use it, but only because its fictional and that the existence of std in omegaverse is unsure. It does not in any case reflect what you should do in real life.

Don't forget to vote or comment!