Thread by @SS_VGC

Alright this thread is all thanks to @pinwi6 for sending me that tweet yesterday about an Enigma in an ABO AU which is a step above an Alpha??? Because, YES PLEASE.

#bakudeku #bkdk AlphaDeku x EnigmaKacchan ABO

"Izuku, you won't believe who I saw at the supermarket yesterday."

"Uh-huh, who?" Izuku absentmindedly responded to his mother, cellphone pressed against his check with his shoulder. He was only half listening to the conversation at this point as his eyes devoured the mission report in front of him.
Don't get him wrong, he loved talking to his

mother; he made sure to call her at least once a week. But being the number 1 Hero in Japan, the new Symbol of Peace, meant he was a busy man. A bit too busy to hear about small-town gossip in the middle of the work day.

"Bakugo, Mitsuki!"

Izuku nearly dropped the phone.

Inko didn't seem to notice as she continued. "They've moved back to town, how wonderful is that? It has to have been at least a decade, no?"

"13 years and 8 months." Izuku slapped a hand over his month. Why did he know that?

Sure, he remembered when Kacchan--Bakugo left.

It'd been a crazy time. He'd saved Ka--Bakugo from a sludge villain. He'd just been told by All Might he could be a hero. And then suddenly the blond announced he was moving? Something about his parents being pissed about the state of Japanese heroes for not stepping in sooner?

"So long indeed! I've invited the Bakugos to dinner next week, will you be able to stop by?"

Izuku bit at his lip. He didn't want to ask, but he needed to know. "Did Katsuki move back, too?"

"No, Mitsuki was telling me he's a hero in America now."

Izuku tried to ignore how his stomach sank. He knew all about Ground Zero's career in America; of course he was number 1 there, top Alpha. Why would he give that up?

"But he's here for now! He was so kind to help his parents transition back. He'll be at the dinner."

"Ah," Izuku's mouth went dry. "Okay, well, I'll do my best to make it?"

"Wonderful! I'll send you the details so you have them on your phone. Do you think your friend still likes spicy curry? I know Mitsuki always adored spicy food."

"I wouldn't know." Izuku felt his face heat.

"I think I'll make it anyway. Have a great day sweetie! Love you!"

"Love you too."

He hung up the phone. Things had been...different when K-Bakugo left. They weren't friends; they weren't even friendly. Bakugo had yelled at Izuku that he didn't need saving and then left.

But Izuku wasn't a weak crybaby anymore. He was a Pro-Hero, the number 1. He'd presented as Alpha, bulked up significantly. He could hold up the world on his shoulders and the magazines said he could charm any Beta/Omega with just a look.

So why did Izuku feel like a mess?

The night of the dinner came too soon. Izuku wasn't mentally prepared. Nevertheless, he set his shoulders, puffed out his chest, and knocked on the door of his childhood home.

"You made it!" His mother smothered him a hug despite only reaching his waist. "The Bakugos are here."

"Great." Izuku lied.

He walked through the doorframe but waited for his mother to take the lead further into the house. Sure enough, their living room couch held all three members of the Bakugo family but as soon as Izuku laid his eyes on Katsuki, he couldn't look away.

The magazines had said Katsuki was an Alpha but they had to be wrong. Or maybe Izuku wasn't an Alpha after all. Because the second they made eye contact, Izuku melted. A whimper hung on the tip of his tongue as his knees turned to jello. His head lolled to the side, inadvertently

presenting his scent gland, an obvious act of submission. Oh god, he was a simpering mess all from one look. In front of guests. In front of his /mom/.

And by the sharp smile on Katsuki Bakugo's face, the other man knew it.

"Izuku-kun! It's been so long!"

Izuku tried to compose himself, he really did, but he kind of just stood there as both of the Bakugo parents hugged him. His eyes were still on Katsuki who hadn't moved. "It-it's nice to see you."

Mitsuki pulled back and gave him a strange look before she turned back to her son.

"Oi! Brat, cut it out!"

"I'm not doing anything." Katsuki smoothly replied in a voice so low that it resonated with the beat of Izuku's heart and restarted its natural rhythm. He was going to die tonight, wasn't he?

"Like hell you aren't. Stop with the pheromones!"

Pheromones? Izuku hadn't noticed anything, but now that he took in a deep breath he realized that the spiciness in the air couldn't be the curry his mom planned to cook. It was too strong, too rich, and there was a hint of something else to it. It was addicting.

"I said, stop!"

Katsuki rolled his eyes and suddenly the air thinned. Izuku blinked like a fog had lifted. He looked around the room, avoiding Katsuki to take in the angry Mitsuki, the frowning Masaru, and his mother--what was wrong with his mother? She sat with empty, glassy eyes and a smile.

"Look what you did to Inko! You damn brat."

"Sorry, Auntie." Katsuki didn't sound sorry.

Mitsuki growled in warning before turning to the Midoriyas. "We're used to his scent by now, but Katsuki is...special when it comes to his Secondary Gender."

"Special?" Izuku whispered.

"Special," Katsuki answered, standing for the first time. He walked toward Izuku slowly, so slowly. Even with the scent gone, Izuku felt like he might fall to his knees. "I'm surprised a nerd like you didn't guess already."

Katsuki stopped in front of him, waiting for an answer.

Izuku had a hard time thinking but suddenly it clicked. "You--you're an Enigma?"

Katsuki didn't confirm but his smile, all pointed canines was enough.

Ho--how! Enigmas were so rare; practically a legend! They say only 1 is born a generation, if that. Good thing too.

Enigmas had the ability to make any Secondary Gender submit; they could even impregnate an /Alpha/ by somehow tapping into a secondary reproductive system otherwise squandered by their own hormones. The thought made Izuku's face heat up.

"Alright! Who's hungry? We should eat."

Izuku, now realizing that he Katsuki were still staring, forced himself to look away. He'd never been more thankful for a distraction and quickly made his way into the kitchen to help with serving.

Dinner was hell. Izuku tried to keep up with small talk, to keep his eyes down.

Yet, he could still feel Katsuki watching him. Those red eyes were like magnets and Izuku wasn't nearly strong enough to keep from glancing up at them every few seconds. It was like Izuku was in middle school again, drawn to Katsuki and blinded by him at the very same time.

Katsuki didn't say much. He answered all of Mama Midoriya's questions about his life, but never asked any of his own. He enjoyed America, would stay only the week. He loved being a Pro-Hero, especially loved being number 1. Single. No girlfriend.

"No boyfriend, either."

He looked at Izuku when he said that. Why did he look at him when he said that!

Dinner went by in a blur. Every moment felt like a strain on Izuku's heart but when it was over, Izuku nearly cried out in pain. There was no way Izuku would see Katsuki again, after all.

Which was good. Right? Right.

Izuku stood dutifully by the door like a good son, right next to his mother as he waited for her to hug her guests good bye. He hugged them too, Mitsuki first, then Masaru. Then--

He was shocked when Katsuki leaned in for a hug. He froze.

But Katsuki seemed totally at ease. His impossibly muscular arms wrapped around Izuku's back, lips against the shell of his ear. "It was nice seeing you again, Deku."

Izuku shivered as Katsuki leaned away, but it didn't go unnoticed how Katsuki's hands trailed down his back

and into the back pocket of Izuku's jeans, dipping inside them for a brief second. Only a second.

Izuku couldn't form words as the Bakugos left. His mother closed the door. He stayed around to help clean up, but the second he walked out the door, he reached into his pocket.

In perfect calligraphy was the word "Kacchan" and a phone number.

He was a goner.

Oh my god, this is probably my favorite thread to write. I'm thinking of turning this into a NSFW one-shot for AO3. Answer the poll to let me know!