Chapter Text
There's no way that he, Bakugou Katsuki, was a mother fucking omega. He just couldn't be, not after Deku presented as an alpha. Now, that same nerd sat behind him smelling delicious. Bakugou knew he was going to present this week by the sensitivity of his nose. Sure, he had noticed Deku's scent last month when he presented. The way Deku smelled of the forest after a spring shower, but so did the whole class. It had faded quickly enough. Though now the scent was engulfing him to point of distraction. He really wanted to punch that dork in the face.
It was that time of the year. The first omega to begin the chain reaction was that lipless bastard in Class B. He went home the day before his heat began in proper, but it was too late. Class B had already been flooded with omegan pheromones. The omegas would soon, one by one, begin slipping into their own heats but not before a hellacious week of flirting. Omega's would be more sensitive to touch and smell in the 3-7 days before their heat. This was the pandemonium the students referred to as, "mating season".
As always, Todoroki began his leave at the first whispers of Honenuki's heat. None of his classmates thought twice about it. The repetitive nature of his avoidance of this week had most speculating that Todokroki was an omega. Outside of this peculiarity, he had never given indication of any dynamic. Due to his heavy use of suppressants, even his scent was a mystery. The presented omegas in 1-A were Kouda, Uraraka, Ojiro, and Ashido. Bakugou had NO interest in joining their ranks.
Soon the stream of confessions would begin. The others, betas and alphas, would take this opportunity to ask out the suddenly sensitive and slightly needy omegas. Not that it was always successful, but the omegas would be more candid about their feelings, more sympathetic. Bakugou's own sensitivity seemed to be alpha centered. What was he going to do? Snuggle up on a beta, hoping they won't try to fuck him? The thought of it made his stomach wretch.
On the first day "mating season" struck Class 1-A, the class was already buzzing with anticipation. Ojiro and Hagakure, the only mated pair in class, were in constant contact. Though he sat two rows away from her, his tail would snake around Shoji's chair to caress his alpha. Their mixed scent smelled like bubblegum and freshly churned dirt. For Ashido and Uraraka it began with calling the other by her first name. Rumor had it that they spent their heats together. An omega pairing was rare so they brought many spectators from other classes to pine over the cute couple.
Bakugou's first hint of his inclination came on day three. Kouda had already began his leave, the pheromones too thick for his sensitive composition. First thing in the morning, Kirishima bopped his way over to Bakugou's desk.
"Ne, Bakugou," Kirishima sighed, putting his weight into Bakugou's desk. He leaned in deep and with a breathy whisper, "Can you imagine those two spend their heat together?" Bakugou's eyes drifted to their omegan couple. Three days deep found them nuzzling into eachothers necks and giggling at secrets passed in whispers between them. Bakugou took note of how much this cycle was effecting his friend. It was uncharacteristic of the red head to take note of another classmate as anything but platonic. He never gawked at omegas and was more the type to go red if one would brush against him in the sensitive time of mating season. Bakugou's attention was slowly drawn towards the scent his friend was no doubt unconsciously seeping. As he sniffed at the air, the smell of burning cedar and damp stones invaded his nostrils. Then Aikawa-sensei walked in and the scent was gone. Everyone returned to their seats and he continued about his day.
After an impressive show of force during hero training, Bakugou sauntered back to the group, a cocky smile playing across his lips. Praising his friend, Kirishima threw an arm around Bakugou and pulled him close. The omega's nose was flooded once more by the comforting scent of river stones and cedar. "Ne, bastard, you smell good," Bakugou said softly, without his usual edge. He began to draw his nose slowly up the other boy's body. Kirishima blushed as the other boy got to his neck, just opposite his scent gland. Bakugou's mouth began to water.
"Hey Bakugou, could it be.." a big smile crept across his face. Kirishima gripped his friend's shirt. "Is our little Bakugou, finally presenting! As an o-" Kirishima was cut off by an explosion assaulting the arm draped around Bakugou. Luckily for the red head his quirk activated in time to stave off any real damage.
"Shut up! I'll kill you, bastard!" Bakugou, yelled while marching off.
"Hey, don't be like that." Kirishima called after him. He followed the blond around a corner. "STOP", he commanded unconsciously heavy with alpha authority. Bakugou found himself locked in place. The red head grabbed him by the wrist and spun the blond around to face him. Bakugou's sharp eyes were dripping with anger but also with something else. Kirishima had noticed.
"Let go of me, asshole, or I'll end you", Bakugou snarled through clenched teeth. Just because Kirishima was the only non-shitty person in class, didn't mean Bakugou wouldn't put him in his place.
Then the red head caught a whiff of a summer storm. It was his turn to lean in. Bakugou, had been in a hurry to escape. Only now he realized that they were alone. That he had been grabbed after rounding a corner. No one could see them now. This sent a shiver dow his spine that reverberated deeply beneath his gut.
"Stop", Bakugou threatened. He wanted desperately to shake off the hand around his wrist. It wasn't even tight. It was cool and relaxing. The coolness of Kirishima's skin complemented his scent. It washed over him. Bakugou was standing still in a raging river, trying not to be taken down stream. What was happening to him? Since when did his friend make him feel such intensity?
Kirishima walked forward, still clutching the blond. Trying to fight the swelling inside his chest, Bakugou backed away. He feared the shooting sensations of need any further contact would send through him. Then his back was at the wall and Kirishima was pressed against him. Oh god, did he feel so fucking good. Control was spiraling out of Bakugou's hands.
"Is it true? You like my scent?" Kirishima tentatively inquired. It was barely over a whisper as if he didn't notice their isolation. It was as if he were sharing a secret and in a way he was. "No ones ever told me that before," He blushed. Then he did the unexpected, an intimate gesture saved for long time mates. He tilted his head and presented his scent glad to Bakugou. His pheromones flooded off him. The tide was too strong and now Bakugou was drowning.
Bakugou was instantly hard. He interlaced his free hand into red spiky hair and gripped tight. He shoved his nose into Kirishima's sweet spot. Bakugou's hot tongue lapped at the gland. Kirishima moaned. No one had ever touched him in this way before. To be desired in an adult way. He'd stepped through a door he did know was there. A sudden fear jumped from the pleasure. Kirishima shoved himself back off the hungry boy. Both boys hot, hard and panting. The world spun a little faster. Their hearts threatened to leap out of their chests. Faces red they both fled. They each were desperate in their sprint. Simultaneously they stopped, believing that they had put enough distance between the other. But then they made eye contact. They had inadvertently fled in the same direction at the same pace. Each boy jumped.
"Don't fucking follow me!" Bakugou exclaimed. His face still beat red.
"I-I didn't," Kirishima stumbled over his words. His face equally red. He took a step forward with his arms held out.
The scene against the wall was still fresh in Bakugou's mind. It played on his eyelids when Kirishima began his approach.
"Stay the fuck away from me, PERVERT!!" Kirishima pulled his arms back in shock at the acid being spewed by his dear blond.
"No, that's not...", the red head attempted to defend.
"You still have a fucking boner, alpha bastard!" Bakugou pointed out, gesticulating wildly while Kirishima attempted to cover his shame. This back and forth drew on for several more minutes. That is until Kirishima fell to the ground laughing.
"Omega or not, it really doesn't matter. You never change." He chuckled. This sent Bakugou into one of his you-looking-down-on-me-punk fits. The normality of the interaction soothed Kirishima's anxious heart. "You're still the manliest dude I know." He cooed. The stroke to his ego was all that Bakugou needed to put the situation behind the pair. They made their way to the classroom, Bakugou sauntered with hands in his pockets, masculinity reinstated. Silently they decided to put the event behind them. They were foolish to think that it would be that easy. Mating season had just begun.