Chapter Text
Izuku growled as he stared at his phone. He stood in the middle of the mall a day after the entrance exam for UA. He had met Allmight almost two years ago. He had received OFA a year ago, and the only people who knew were him, Allmight, and Katsuki, who wasn't answering his texts. They had gotten closer after the Sludge villain. It had been the first time Izuku had seen the bruises left by Katsuki's mother.
"Come on, Kacchan. Answer your phone!" He hissed quietly. He was so focused on his phone he walked right into a woman with pale blue hair.
"Oh, I'm sorry," Izuku said as he looked up at her bright yellow eyes. Her smile was wide as she turned to face him, placing her hand on his shoulder.
"You will be gifted with the Alpha." Her voice was like silk. Izuku groaned in pain as his whole body ached. His mind felt like it was pulled in two. "I Bless you with happiness as I bestow Omega to your mate." She said as she placed her hand on his other shoulder. Izuku's eyes widen as a voice screams in his mind.
'Omega!? Where is Mate!? Kacchan? Is mate Kacchan? Must find. Now. NOW! FIND NOW' Izuku stumbled away from her as he felt the voice get louder. His body felt numb as it moved on its own. Once outside the mall, his body worked on its own, activating OFA and shooting himself into the air.
///
It took him 10 minutes to complete a usual hour trip. His body ached at how far the thing had forced it. His body stopped just outside Katsuki's house and sniffed. Izuku was overwhelmed by the sudden scents, there were so many. The thing whined and started to pace.
'Where' It spoke in his mind.
"top-right window in the back of the house," Izuku replied. He wasn't sure why he told this thing where his best friend was, but if it meant making sure Katsuki was okay, he'd do it. "But don't be seen by his parents." The thing in control crouched down and crawled on all fours around the house. It quickly climbed the tree in the backyard close to Katsuki's window. Izuku felt like puking at the sight through the window.
Katsuki was chained to the wall, thankfully low enough to the ground for him to sit. He was naked, his knees brought to his chest. Izuku could tell by how Katsuki trembled that they had turned the AC up in his room. The thing in his mind whined loudly at the sight. Izuku's body moved into a crouch before kicking off the tree, wrapping his arms over his head before crashing through the window.
"T-The fuck!" Katsuki snapped past his chattering teeth. Izuku's body crawled over to Katsuki and sat directly in front of the blond teen. "D-Deku?" The thing whined in response before pulling Izuku's shirt off.
'What are you doing!?' Izuku screamed in his head in embarrassment. Katsuki's cheeks dusted a light pink as the thing pulled Izuku's pants and boxers off as well.
"D-Deku w-what are you d-doing?" Katsuki asked as he tried to shrink back against the wall. The thing gripped Katsuki's knees and forced them apart, despite Katsuki's struggles. The thing pressed Izuku's body against Katsuki's, forcing Izuku's face into Katsuki's neck.
"Warm?" The thing asked as it wrapped Izuku's arms around Katsuki's waist, pulling him up off the ground before sliding Izuku's knees under him, relieving some of the stress on Katsuki's wrists. Katsuki nodded weakly as he tilted his head, letting the thing press closer to his neck. Katsuki wrapped his legs around Izuku's waist, desperate for his best friend's warm skin.
///
Katsuki wasn't sure how long the two of them had sat there as he drifted in and out. He had never realized how warm Izuku was until now.
"Pain. Sorry" Izuku said before he sank his elongated teeth into Katsuki's neck. Katsuki gripped the chains his wrists were in as his body tensed at the pain. He felt an intense pain in his stomach. He was grateful his parents were away as he heard himself scream. His body ached, and spots on his neck, wrists, inner thighs, and just above his ankle burned. When the pain finally subsided, his body went lax in Izuku's hold. Beads of sweat ran along his skin, making him even colder. He grit his teeth as another sharp pain ran through him, stopping just behind his balls.
"Fuck" He snarled as his skin pulled apart. He tried to pull his legs closed, digging his knees into Izuku's sides. His body went numb to him after a moment.
'Alpha?' He heard a snarl in his head. He had no choice but to watch himself lean forward and sink his own teeth into a red spot on Izuku's neck. He held on for a minute before the feeling in his body returned.
"Kacchan, I'm sorry," Izuku sobbed as he leaned away from Katsuki. "Oh god, there's so much blood." Katsuki's eyes followed Izuku's. The OFA holder's legs were soaked in blood along with Katsuki's thighs. Katsuki felt himself whine as Izuku pulled away from him, taking the warmth with him. "I-It'll be okay, Kacchan. I'm not leaving. I'm just going to get some clothes for you and put my own on. We need to get you to the hospital." Katsuki wasn't sure why those words comforted him, but they did. He let his legs stretch out as he leaned his head back and watched Izuku.
"Deku, what happened?" He asked, his voice tired.
"I don't really know. Some woman touched me at the mall, and something took over my body." Izuku said as he dug through a small plastic dresser. It didn't take long for him to pull out Katsuki's casual clothes. They were simple, and there were really only three pairs of clothes. "Why dont you have more clothing?"
"I spend most of the time at home naked," Katsuki whispered as Izuku came over. He winced as the boxers were pulled up around his hips, rubbing the spot that had bled.
"Sorry," Izuku whined. Katsuki leaned forward as much as he could, gently rubbing as much of his cheek against Izuku's as he could. The Alpha froze. "Kacchan?" He whispered, shock in his voice. Katsuki yanked back and snarled, not sure why he had done that.
"Hurry up, shitty nerd!" Katsuki snapped. Izuku showed a sad smile before pulling Katsuki's pants up. Izuku stood and grabbed the chains that held Katsuki. Before he could do anything, his phone went off. Izuku pulled it out, answered it, and put it between his ear and shoulder as he gripped the chain again.
"Hello, mom," Izuku said before grunting and breaking the chain using OFA 100%, somehow not breaking anything. Katsuki's arm dropped, causing him to hiss in pain. "No, I'm not at the mall anymore." Izuku broke the next chain before leaning down. "How many cases?" He grabbed Katsuki's shirt. "Mom, If they are saying people who have been affected need to go to the hospital, then I need to go" Izuku sighed as he pulled Katsuki's shirt over his head. The blond glared at him as he gently moved Katsuki's arms. Katsuki was tired, and his body felt like it had turned to stone. He hated looking weak, but the thing inside his head purred at being taken care of. He hadn't realized he was physically making the sound until Izuku stopped and looked at him with wide eyes. "Are you okay, Kacchan?" He asked.
"Do i look okay to you!" He snapped, his cheeks pinking up.
"Yes, mom, I'm with Kacchan," Izuku said, his own face heating up. "No, we're both going to the hospital." Izuku stood up and stepped back, glaring at the wall.
///
Izuku wasn't sure why he was so irritated. He was used to his mom worrying all the time.
'Why does Katsuki need to go to the hospital? Were you at the mall with him? You know how his mother feels about that. Plus, you were supposed to be at the mall with Toshi!' She said.
"I wasn't at the mall with Kacchan! Mom, I can't right now, Kacchan is bleeding, and i have to get to the hospital. Please just meet me there." before she could say anything, he hung up.
"Dam. I've never seen you hang up on her before," Katsuki said, his voice showing just how tired he was. Izuku felt guilt settle in his gut.
"I don't really know why but she kind of irritated more than usual," Izuku said as he looked away, rubbing the back of his neck nervously. "Can you stand?" Izuku asked. Katsuki pushed himself to stand, his legs shaking as blood collected at his feet.
///
Katsuki how weak he felt by just simply standing. He tried to take a step forward, but the friction between his legs shot pain up into his stomach, causing him to fall. When Izuku caught him, he couldn't help rubbing his cheek against the other's shoulder. The smell of a brand new book and ocean mist filled his nose. He felt the thing in his head shiver in pleasure at the scent as a wave of safety washed over him. He was slightly aware that Izuku was smelling him as well.
"You smell like honey and smoke," Izuku whispered as he pressed his face into Katsuki's neck. It took Katsuki several minutes to struggle back the control of his actions. He roughly pushed Izuku away before dropping to his knees.
"Fuck! Deku, what did you fucking do to me!?" He snarled, surprising himself when he felt it spread to his chest and get louder. The thing in his head whimpered when he heard Izuku whine like a beaten animal.
"I dont know! It's not like I had control of myself! Did you when you bit me!?" His voice was panicked, which caused the thing in Katsuki's head to pace, his own anxiety increasing. Katsuki opened his mouth to snap again, feeling out of control, but stopped when he was hit with intense dizziness. He quickly pressed his forehead to the cold floor, groaning as he felt more warm fluid slide down his legs, pooling in the knees on his pants he had pressed to the floor. His vision blurred as another wave of exhaustion hit him. "Kacchan?" Izuku whispered as he came over and placed his hands on his best friend's shoulders. Katsuki heard him sniff lightly before another whine broke from Izuku. "We need to get you to the hospital. You're still bleeding." Izuku wasted no time picking Katsuki up bridal style. Katsuki felt beyond lightheaded as he started to see black dots in his vision.