My Hero Academia: Blood and Fire

Following the birthday party Celestia, Selene, and Izuku found that nothing much changed for them, because after they turned five they ended up spending another year in preschool with the rest of their group, meaning Katsuki's group had yet more chances to pick on Izuku, with his sisters watching over him. At first it got old and tiring, that he and his pals wanted to pick on someone that had no Quirk, Selene found that it made no sense when she thought about it, but after some time she decided not to question it and just saw it as a challenge of sorts. It allowed her to heighten her senses with her tiger form and her various ways to manifest her transformation Quirk, like her claws, tail, ears, or even turning her hooves into feet so she could run faster, and the last one was one of her favorite since the paws felt better than hooves. Celestia was about the same, she found new ways to utilize her dragon transformation while dealing with Katzuki's pals, even though both made sure to let him attack first since they could use their Quirks to protect themselves, even if they got in the way of his constant bullying.

Izuku, as per usual, was saddened by the bullying and did what he could to get used to things, though while Celestia kept on focusing his efforts on being a support person for the heroes both she and Selene knew that he would continue to seek the hero life style, even with his lack of a Quirk. In addition to that he continued to expand his Hero Notes, which seemed to be all of the information he had on the various heroes and their Quirks, filed away in the journals he worked in and constantly updated whenever he found new information to be added to one's power. He also made a second for the villains he and the rest of the country knew about, plus the Quirks of those who appeared in the news from the other countries, because he had a deep fascination with Quirks and wanted to make use of it in his own way. Celestia and Selene found that it was good information to have, as a hero agency could use the notes he had to better improve some of the gear their heroes used, it was obvious when they considered how much he learned from Celestia's lessons and applied that to his true desire.

Selene, as per usual, was the only one among the siblings that knew their father's villainous secret, though at the same time she continued to check in with him on his search for Izuku's perfect Quirk, only to find that he was still searching, going all over the globe and observing the powers of others.

Other than that there was nothing else for them to really do, so Selene continued to train her Blood Singularity by drinking the blood of those who had interesting Quirks, thanks to the good doctor providing the samples for her to use to train her Quirk up, such as giving her samples of Nine while he was using his other Quirks. It was an interesting power, allowing her to make another's power her own if she ingested enough of their blood, and from what she could tell all types of Quirks were open for her to copy with this power, though she had to train each one if she wanted to use them. Hisashi and the good doctor were more than willing to help her grow this particular Quirk, especially since it was so unusual, so some of the very Quirks that her father was observing for Izuku ended up in her possession by collecting blood samples. Other than that she spent a few hours at the bar as well, talking to Kurogiri or her father in private, but Hisashi made sure she was gone before the others he was working with entered his domain, since he wanted to keep the fact that he had kids a secret from the rest of the villains.

As their last year of preschool came to an end, however, Hisashi had a surprise for them, to enjoy their summer he was going to take them out camping, and while Inko had some reservations on the idea she agreed, as he was taking them to one of the safest camping areas in the country, and this would also happen shortly after their sixth birthday.

Celestia and Selene found that camping out in the wilderness was actually a nice thing, especially after being in the city for two years without really leaving it, save for the times where they went to the beach and just had fun, though they did have to share a tent with Izuku while their parents shared the other one. The siblings found that the night was full of peace and quiet as they stared up at the stars that Selene pointed out to her brother and sister, since this was her area of expertise, which meant they could sit on one of the large stones as she pointed out at the stars. As Selene expected Celestia didn't have any of her solar powers while it was night at, this essentially proved it since her sister was unable to call on Sunshine, which was an odd thing since this was different from what she experienced in their home world, but it was still interesting to see. Izuku helped tend to the fire, making sure it had enough branches and twigs to keep going while ensuring that it didn't get out of control, while at the same time their parents were just happen that they were having fun, even if it was in a smooth rocky area with a small creek nearby.

When morning arrived they found that Inko wasn't able to cook what they were used to, but with the equipment that they had on hand she was able to make a good meal that gave them energy to face whatever the day had to throw at them, as Hisashi was taking the three of them out for a hike.

"Be safe, and remember to run if you run into trouble." Inko said, as she knew that she wasn't cut out for the walking part of camping, but trusted her husband to keep track of the kids while they were out, since this was his idea and he seemed more ready for this than she thought he'd be, "And remember to keep an eye on the time, as I want you back here around noon for lunch, then we can go to the park and relax before we head home."

Celestia, Selene, and Izuku nodded their heads before they followed Hisashi along the track that was the one he wanted to use, since it was the one that was more kid friendly, smoother than the rest of the paths and allowing some of them to just run ahead if they wanted to, which was what Izuku did while Celestia kept an eye on him.

"So, I've been thinking... why don't you and the good doctor modify Quirks to get what you want for Izuku?" Selene asked, as it had been bugging her for quite some time, because they had the power to duplicate all sorts of Quirks and her father had shown that when he removed a Quirk the person wasn't stunned or exhausted at all, but she made sure to keep her voice low so only her father could hear her.

"Because it's impossible. We tried, but haven't been able to do it... trust me, if it were possible I would have done it by now, since the search has been going on longer than I expected." Hisashi replied, also after making sure they were alone, in fact it sure looked like it was only him and his children right now and both Celestia and Izuku were well outside the range that his and Selene's voices could reach, so they could speak for a time, "I'll be honest, I have no idea what the problem is, but each time we try to modify a Quirk the power ends up 'resetting', as the good doctor calls it, like the Quirk returns to their original form... it's like trying to save a new version of a file over an old one, and the save failed. It's like there's something preventing such a thing from happening, so I can't just make the perfect Quirk for Izuku... trust me, Selene, if it was possible I would have done it already, as I hate myself for putting my son through all of this Quirkless business."

"You were just trying to protect him. No one can fault you for that." Selene said, though she was annoyed that her idea was a waste of time, as she had been hoping it was the key to giving her brother whatever power their father was looking for so he could have a Quirk, before she considered something, "Maybe it has something to do with the Vestiges, the will of the one who had the various Quirks originally? Maybe they're fine with having their power stolen, even if I don't create them since I'm just making their power my own, and the Vestiges are rebelling to keep the Quirks in their original form?"

"Maybe. Honestly, it's impossible to know for sure." Hisashi said, though it was easy for Selene to see that her father wished it was a simple thing, to just take a Quirk and modify it so he could create the perfect one for his son, but as he took some time to think about that he noticed that Izuku was running towards them with a concerned look on his face, "Izuku, what's wrong?"

"It's... It's Celestia. Something is wrong with her, as the air started getting hotter and she just stopped in her tracks." Izuku said, the concern in his voice informing them that he was worried about his sister, something that got the pair moving once he stopped talking, even though Selene knew of only one thing that this could be and couldn't believe it was happening right now, while they were having fun on a simple camping trip.

"It's probably her Quirk... what time is it?" Selene asked, before noticing the clearing that Celestia had stopped in, where she could see that the solar aura was incredibly strong right now, which was no doubt why Izuku had rushed to find them since he knew touching his sister's arm would have been a bad idea for him.

"According to the phone it is almost noon." Hisashi replied, though at the same time he briefly recalled how they explained the nature of Sunshine, that Celestia's power grew with the rising sun and it lowered when the sun was setting, which was why when it was night out she had next to no power and midnight likely meant she was at her weakest, before he realized that the inverse was likely true as well, "No way."

"Yes: her power rises and falls with the passing of the sun, and when noon arrives she would reach the peak of the power that Sunshine would give her." Selene commented, as she could see it, the solar power that was wrapped around Celestia's arms, legs, and body, while at the same time it formed an aura around her that was likely an intense heat shield to stop any and all attacks from hitting her, in fact it looked like her sister's eyes and hair were blessed with solar energy, "This could be her 'ultimate move', to use the terms of the heroes, a form that grants her perfect offensive and defensive powers, a near invincible mode."

"Like the 'Invincible One' or something?" Izuku remarked, though he thought it was cool that Celestia's Qurik was evolving in such an interesting way, or maybe it was just that they were uncovering something new as time went on, and it made him all the more eager to see what the future held in store for all four of the Quirks that his sisters possessed, as Sunshine, Dragon, Tiger, and Hydra were all amazing powers in his eyes.

Selene nodded as Celestia seemed to move her right hand like she was swinging a sword in a horizontal line towards the loose ground, a very light gash opening as she understood that her sister was definitely tapping into the power of the sun, a fact that worried her more than she was willing to admit, before the peak of the day passed and the form diminished back to the point of nonexistence, causing her to catch her woozy sister.

"What could have caused it to manifest?" Hisashi asked, as that seemed like a portion of the power that came because she and Izuku were in danger, or at least that was what he assumed even though Izuku said that they were just walking before this happened, but he was happy to see that Celestia was fine.

"I think... her body was just ready to experience it for the first time." Selene replied, though she could tell that her sister was just fine, it was just a surge of power she wasn't ready for and had recovered from the usage of that power with ease, but it made her curious as to how her sister would develop her power in the future.

Hisashi nodded as they helped Celestia onto her feet and decided to head back to Inko so they could wrap up their trip, but this really made him interested in what sort of powers or skills his daughters would develop in the future, not to mention how Izuku would grow as well, and it made him look forward to what the future held for him and his family.