Chapter 3

"Midoriya," Shuota said in a steady, no-nonsense voice. There was an underlying tightness and wariness in the undercurrents of his tone. "Get a hold of yourself." His posture was tensed. He was ready to immobilize his student any time if he made any sudden motions. He didn't want to hurt him, but if he was going to persist, then he had no choice.

The green-haired teen being so close to his bonding gland set off a mixture of different deep-sated instincts within him. He couldn't differentiate them from each other, and he had no idea where each one ended and began. They started mixing together in a jumble, leaving him conflicted and confused. What did his body want?

Izuku felt like he had a bucket of cold water splashed over him. He almost tripped over himself trying to scramble away from his teacher. Oh god, what had he just done?!

The ex-Omega slowly backed himself into a corner of the room, the furthest he could put himself from his teacher. He didn't want to chance anything. Sure, he'd managed to get himself under control at the last moment but putting himself that close to the source was just a disaster waiting to happen.

Izuku took a steadying breath, momentarily forgetting about the source of his troubles, and once again regretting his lack of foresight. Were Alphas supposed to smell this good? He'd wondered if changing from an Omega to an Alpha would have any side effects, but frankly, Alphas had smelled attractive to him just a mere 24 hours ago.

He thought that might have changed somewhat since he'd transmigrated into an Alpha body. Good to know he was wrong. Izuku thought back to the past few hours. Sure, it seemed like his sense of smell had heightened as compared to before, but when he had met those people on the street, they hadn't set him off like how Aizawa-sensei had set him off just moments earlier.

Was there a reason for that?

The green-haired teen stumbled as a wave of dizziness hit him. Startled, Shouta barely managed to use his support item to grab his student before he hit the ground. He didn't know what the fuck had just happened, but he still had his dignity as a teacher to uphold.

Shouta walked forward to check on his struggling student. "What's wrong?"

Izuku brought up his hand to try and block some of the scent from addling his brain even further. "I…I don't know. I just felt a wave of dizziness."

The moment Izuku acknowledged the dizziness, it felt like everything wrong with his body suddenly made itself known to him. It felt like a surge of everything and nothing all at once. He felt a bone-deep tiredness washing over his body, as well as a heat that was building up deep within him. He felt both lethargic and felt like he was filled up with energy at the same time. It felt strange having two contradicting feelings clash with each other.

It almost felt like when he was in heat. But he'd never had a heat as intense as this. Wait. He was an Alpha now. Does this mean he's in rut? But he took his suppressants just moments earlier. They should already be working. He felt rather indignant. This wasn't supposed to have happened. He was just supposed to have found Aizawa-sensei, get permission for a short break, gather some information, and come back like nothing happened.

Everything was spiralling out of control. Izuku felt resigned to his fate. He buried his face in the soft cloth, and for the nth time that day, regretted it. It felt like the heat was burning him up from the inside. His inner Alpha was pounding at the cage keeping him locked up.

The softness brushing against his cheek was quite literally infused with Aizawa-sensei's scent from how long he'd had it wrapped around his neck. Izuku panted with the effort from ripping his face away from the cloth.

The green-haired Alpha would've slumped to the ground without the support of Aizawa-sensei's cloth. He didn't know if he was thankful or not. On one hand, it was helping him. On the other, it was also giving him some other troubles.

Shouta politely coughed and looked up to the ceiling for strength.

"Kid," he started before stopping, not quite sure how to put it. "You might want to take care of that."

Izuku shot his homeroom teacher puzzled eyes. What did he mean? He followed Aizawa-sensei's gesture and looked down. He was mildly surprised by the boner he was popping. He thought he'd be more embarrassed, but he was feeling strangely detached right now.

He felt kind of floaty and high. Kind of like when he had been shot up with painkillers. He felt cool hands on his forehead. "You're probably going into a rut. Haven't you been taking suppressants, kid?"

Izuku couldn't stop himself from nuzzling the hand, his mind automatically falling back onto Omega reflexes. The Alpha inside him railed at this. He whined when the hand retreated, eyes popping open from the loss, his inner Alpha growling at him.

The green-haired Alpha's eyes darted to his teacher's face. He swallowed. He really wanted his teacher. In him, under him, he wanted to wreck the other's stone-cold expressions and add a little colour to his cheeks.

Shouta shivered as his student's hungry eyes landed on him. It felt akin to a hungry predator locking eyes on its prey right before it would be devoured. Midoriya's eyes were particularly intense. He'd never seen them look that way before. The way he was looking at him was a mixture of lust and hunger. His heart was pounding loudly, though you couldn't tell from his expression.

The teacher startled slightly as his student spoke up.

"Sensei," Izuku purred, his voice going low and seductive.

Shouta unintentionally loosened the cloth wrapping around his student due to a slight imbalance in his mental state.

Midoriya always looked so innocent for an Alpha, and everyone had thought he would present as an Omega, so it came as a shock to all of them, sans for Bakugou (of all people), who sported that smug look for a month whenever someone looked the green-haired teen's way in shock.

He may or may not have been waiting to see if he would present as an Omega. If he had been harbouring some hopes, no one could blame him. After all, practically everyone was in love with the green-haired teen, or at least had some sort of attraction to him. They were all drawn to him like moths to flame, and they didn't mind it one bit.

Izuku noticed that the bindings around him had been loosened. He stalked forward, intent on getting nearer to his teacher. He took a step forward as Aizawa-sensei took a step backwards.

Shouta actually let his startled expression show on his face when he felt his back hit the wall.

The inner Alpha inside Izuku purred at the look, feeling pleased.

"Sensei, won't you spend my rut with me?" the new Alpha said, hooking a finger into his teacher's belt, giving it a light tug. He smiled up at his teacher, making sure to add a little sheen into his eyes, placating his teacher's Alpha instincts by acting coy.

"I – what –" Shouta blurted out, his mind short-circuiting.

Izuku made sure to press closer, heeding his Alpha instincts. He brushed a lingering kiss onto his teacher's cheek. "Please, sensei?" he purred out, sounding slightly out of breath.

Shouta groaned, his head hitting the door with a thump. What Midoriya was doing to him was sending him mixed signals. He was an Alpha, but he also wasn't quite acting like one. It was sending the deeply ingrained instincts in him around in circles.

It was just so sudden. He didn't have any time to think it through, and Midoriya wasn't helping by peppering kisses on him. And that hand.

Izuku managed to get the shirt untucked from Aizawa-sensei's belt, unabashedly running his fingers up the other stomach, groping his abs with fleeting, teasing touches.

Shouta was unable to stop the gasp that was ripped from his lips. Fuck! He subconsciously pulled the teen closer to him before realizing what he'd done when he smirked up at him like the cat that got the canary and blamed it on the dog.

The messy-haired teacher groaned again, inwardly scolding himself. He opened his mouth to reply teenager.