Chapter Text
Izuku didn't mean to stay up all night. He knew he wasn't allowed to access the computer without his mommy but he just couldn't sleep and thought he could just watch a few All Might videos until he got sleepy. Unfortunately, that didn't happen and before he knew it, his mother was calling him for breakfast.
While he had been successful in sneaking past her to his room, Inko still noticed the bags under his eyes and the odd face he was making as he ate his tasteless breakfast.
“Izuku, are you feeling alright? You look exhausted.”
Izuku looked up at her and gulped. “I-I, uh, didn't sleep well last night.”
She kissed his forehead. “Poor thing. Your father's side of the family has a history of insomnia, but I didn't think you'd be affected so soon. Would you like to stay home today?”
Izuku quickly shook his head. “No, mom! I can still go to daycare! I-I wanna see Kacchan.”
Inko smiled at that. Katsuki took after his mother and he and Izuku would prove to be a good influence on each other like she and Mitsuki were. She was sure of it.
“Ok, sweetie,” she said. “Finish eating and get your uniform on. We need to leave soon.”
At daycare, Izuku met up with Kacchan, who immediately noticed his friend's bloodshot eyes.
“Damn, Deku! You look like shit,” Katsuki elegantly pointed out.
Izuku sighed. “I couldn’t sleep so I ended up watching All Might videos all night.”
Katsuki clicked his tongue in annoyance. “Dammit, nerd! You need to sleep! How do you expect to be a hero if you're too tired to fight any villains!?”
“B-but I'm not tired,” Izuku stuttered out before beginning to mumble, much to his friend's annoyance. “Not really. In fact, I can't really feel anything or even taste or smell anything. It's weird it's not like when your legs go numb from sitting criss-cross too long but like when the dentist used his quirk to make my mouth numb to take out that tooth but like all over my bod-”
“DAMMIT, KNOCK IT OFF, DEKU!” Katsuki yelled, slapping izuku on the back.
However, in doing so, he activated his quirk for the first time and the explosion not only knocked Izuku forward several feet, but also burned a large hole in the back of his shirt. As the teacher ran to check on the two, Katsuki looked from his still smoking hand to the now exposed skin on Izuku’s back, which wasn't damaged or burned like his uniform.
Izuku turned and the two were just staring at each other in shock.
“WHAT THE HELL!?” They both shouted.
“Well, first of all, congratulations are in order,” Dr. Tsubasa said. After confirming both boys were ok, the director of the daycare called their parents to take them to their local quirk specialist. After several hours of tests, the Bakugou’s were called back first but Mitsuki insisted on having the boys’ results revealed together.
“Both boys have been quite blessed with powerful quirks! However, while Bakugou’s quirk is about what was to be expected, little Midoriya’s is a rather rare case,” Tsubasa said, turning to the Bakugou’s first. “Little Katsuki has inherited a mixture of both of your quirks, being able to ignite a nitroglycerin-like substance he sweats from his palms. However, Izuku’s seems to be different from either yours or your husband's, Mrs. Midoriya.”
“What do you mean,” asked Inko, worriedly looking at Izuku, who was watching starry-eyed as Katsuki made small explosions in his hands.
“Well, given what you've told me of the quirks on your husband's side of the family, he seems to have inherited a recessive durability quirk linked to his insomnia. You see, it seems the longer he's awake, the tougher and stronger he becomes! Even his hair became tougher,” he explained, showing them a pair of chipped scissors. “However, his quirk seems to reset when he sleeps as we learned after an hour long nap and he began losing his senses of touch, taste and smell again after around a half hour of being awake.”
The adults' eyes widened.
“So, theoretically, if he stays up long enough-,” Masaru started.
“Little Izuku could end up stronger than All Might!?” Mitsuki exclaimed, making the other adults jump and getting the attention of both boys.
“Wait, what!?” Katsuki angrily exclaimed while Izuku gaped in amazement.
“Theoretically, yes,” the doctor nodded. “While it seems he already needs less sleep than most children his age, he will require even less sleep as he grows and may be able to stay awake for days, possibly weeks, without succumbing to sleep deprivation! Now, I've made a list of various exercises and tests you can each perform at home, but first,” he turned to the two boys, one looking slightly more annoyed and the other quite dumbfounded. “Have you boys given any thought to what you'd like to name your quirks?”
“EXPLOSION!” Katsuki yelled, as if determined to be the first to name his quirk. After writing it down, Tsubasa turned to Izuku, who was thinking hard about something.
“And you, my boy?”
“Hmm…” Izuku hummed, thumb and forefinger on his chin. He turned to his mom. “Mommy, what did you say daddy's family had? Inso…insom-mania?”
“Insomnia, honey,” Inko corrected. Izuku beamed.
“Insomnia Strength!” he shouted triumphantly.
As their parents were exchanging goodbyes, Katsuki looked at Izuku with a steely gaze.
“Listen, Deku, just cause you got a strong quirk doesn't mean I'll let you be stronger than me! I'm gonna train so hard that I'll be able to make explosions big enough that even your numb ass will feel them! Got that!?”
Izuku nervously smiled and nodded at the declaration. So long as they were both heroes, he didn’t care who was stronger.
As the blonde stamped away after his parents, Izuku barely noticed his mom had taken his hand and the two started walking. He figured the numbing effect of his quirk was going to take a while to get used to.
“So, Izuku, how about katsudon for dinner to celebrate? I'll even invite your favorite uncle! Lord knows that man needs to eat more than those disgusting jelly pouches.”
While Izuku smiled at the thought of katsudon but then frowned since he remembered he wouldn't be able to taste it. However, at the mention of his uncle joining them, Izuku immediately perked up again!
“Can we really invite uncle Sho!? He could help me figure out so many theories I have about my quirk! Like, will erasing my quirk have the same effect as napping? Can my quirk even be erased? What if he-,” Izuku suddenly stopped mumbling when he heard his mother giggling.
“Yes, sweetie, I'll invite him right after we tell your father of the good news. I'm sure he'll have his own questions and theories you two nerds can bond over.”
Izuku blushed and grumbled “I'm not a nerd,” making Inko laugh again and ruffle his bushy hair, noting how it now felt more like steel wool despite looking as fluffy as always.
While not the quirk she or Hisashi were expecting their son to have, Inko was right that her husband was beyond excited when she and Izuku FaceTimed him and explained his quirk, immediately becoming wide awake despite the timezone he was in. While her two nerds were discussing the various tests the doctor gave him and ones they can perform on their own, Inko snuck off to call her disheveled looking brother-in-law.
In a near barren room, a three pawed battle scarred cat was sleeping on a yellow cocoon until said cocoon started ringing and vibrating, making the cat jump. With a groan, the cocoon turned over to show a tired, scruffy face with long, shaggy black hair covering his eyes. He opened one eye to check his phone and then sighed as he answered the call.
“Hey, sis. What's up,” he tiredly answered.
“Hello, Shouta,” Inko answered, far too excitedly. “Guess what? Izuku got his quirk!”
“Good for him. Can I go back to sleep now?” he deadpanned.
“Actually, I wan- I mean, Izuku wanted to invite you to dinner tonight to celebrate. We're having katsudon and he wanted to ask his favorite uncle some questions since it's a quirk different from either mine or Hisashi's.”
Aizawa groaned. “Do I really have a choice?”
“Only whether or not you want me spamming your inbox with pictures of a disappointed Izuku.”
“Fine,” Aizawa sighed. “Mind if I invite my dumbass roommates? They've been begging me to introduce them to the adorable stalk of broccoli.”
“Sure! I'm sure Izuku would love to meet a couple of up-and-coming heroes! Well, I have to go! We'll be having dinner at 6:30. Bye, Sho!”
Aizawa grunted in acknowledgement before hanging up. Sighing as he got up from his sleeping bag, he next texted Hizashi and Nemuri, who immediately texted back confirmations with far too many smiley face emojis.