Disclaimer I don't own My Hero Academia or Undertale.

Author's Note: Sorry for the long wait. Homework is important. Responsibilities with my family are important. Anyway, the story still continues. Thank you all for waiting patiently. I've been thinking I should speed it up a little...Read and Review!

Rule Number 11: I am not allowed to have a sleepover with Shoto Todoroki to teach him the art of pranking. (Even if it is for a good cause). Side note: Endeavor has now banned Shoto from bringing anything back with him. He also banned sleepovers with me. Unfortunately for the natural hazard of a Neon cracked red heart, Shoto has learned the fine art of crafting his own tools for pranking and is now teaching his siblings at night when available. He also uses an extremely smart underhanded maneuver from yours truly. It seems to help him get out of training...

Endeavor knew that Shoto had made friends with the playground fight. It had only been a few days, but the boy wouldn't stop talking about them to his mother, sister, and his only other brother who didn't come to the playground. Endeavor tried resist the urge shudder when he saw his boy talking about them. The kid with green hair had made him, the Number Two Hero nervous. It was as if he looked into his soul in the seconds it took for him to wake up. He could still feel phantom pain whenever he thought about it.

When Touya came into the room and asked his mother if she wanted to get together with a bunch of mothers at a sleepover Endeavor didn't care.

When Rei Todoroki asked who they were, the family names didn't really catch his attention until he said Shields and Yaoyoruzu. Those were names that were familiar.

When Shoto came into the room by poking his head around the corner of the hallway and asked if Deku was going to be there Endeavor paled.

When Rei told him that their children would be going to a sleepover he had firmly told her that only Shoto would be allowed.

His other children sighed in resignation to his demands. The bright smile of his youngest child made him nervous. For some reason he could only feel as if this was a bad idea. For himself.

The parents and children arrived at the Midoriya home. The adults split themselves into the mother and father groups. A dads night out was suggested to keep the house from getting too crowded. The women sat around the living room and drank teas and talked.

Katsuki Bakugou knew Izuku Midoriya like the back of his hand. He had been around when Izuku had asked his parents about sleepovers and had acted innocent when both of their mothers were complaining about not having a girls night and had hinted that maybe they could talk to the other children's parents.

Katsuki watched Izuku when the adults weren't. When a giant grin with shining teeth almost blinded and a crazy glint of green light started to shine in his eye Katsuki knew that Izuku had a plan.

It wasn't until the other kids had introduced themselves and had a hard time coming up with something other than training, studying, and school that Katsuki understood. They all sat around Izuku's room in different positions.

Izuku Midoriya let out a long sigh of disappointment from his desk chair.

Momo asked what was wrong as she poked at his notebooks.

Shoto tilted his head and blinked with his back to the door.

Mei and Melissa looked worried from sitting on his bed.

Shinso asked if cats were cool from a purple sleeping bag he walked in with.

Ochaco wondered if they could play Heroes and Villains from a pillow on the floor beside the bed

Katsuki just chuckled at the other kids from atop Izuku's desk.

"You guys have to have hobbies! They can help you become better Heroes! Like I use Puns and try to do pranks so I can learn how to sound cool and be stealthy. Shinso, you could learn from cats. They are really stealthy and I'm sure you can make a lot of jokes about them. I think I've heard of things like memes? Maybe you can try that out?"

"Wait a minute! You all want to be Heroes? Wow!" Melissa beamed. Then she frowned. "But I'm Quirkless."

Izuku smiled at her. "You can still be a Hero to other Heroes though. We still need gear for being Heroes! Your dad is famous with gear!"

Mei turned to Melissa with a grin. "We can be the ultimate gear makers! It'll be awesome! We can still be Heroes no matter what! Two heads are better than one!"

Mei and Melissa laughed.

Then Shoto made everyone silent with a single question.

"What are pranks?"

Katsuki looked shocked. Momo and the rest of the girls were appalled. Shinso's jaw dropped. Izuku just paled.

"What do you mean you don't know what a prank is?" Whispered Izuku.

"I mean I've never heard of something like that?" Shoto tilted his head in confusion.

It was at this moment Izuku started to twitch. "Everyone!" Izuku stood. "We must educate Shoto on how to do his own pranks. All in favor!"

Each of them stared at Shoto. "Wait! What?"

Everyone else yelled out an "Aye Aye Captain! Yes! We must do our best!"

"Everyone here agrees Shoto. You will now be taught the Art of the Pranks!"

It was at this point that a patrolling Endeavor watched one of his Sidekicks put cuffs on a criminal. A shudder went down his spine.

"Boss are you alright?" Asked the Sidekick.

"I don't know. I hope so. I have this feeling that Shoto has done something. It must just be my imagination."

Back at the Midoriya home, Izuku left Katsuki to explain how pranks can be used and went to mom room as the kids labeled it. A small talk amongst the girls and learning that one had a Quirk to create almost anything and her needing food along with two genius mechanics required him "The Captain," as labeled by Mei and Melissa, and "Boss," by Momo to get foodstuffs for the group.

"Hey Mom?" Izuku poked his head out the hallway into the living room. "Can we all have some snacks?"

Inko Midoriya smiled. "Sure we will bring some soon. Do you want to watch a movie with us?"

"Nope! We're having a lot of fun! We are playing a cool game!"

"Oh! What is it?" Asked Rei.

"How to Prank a Villain!"

"What are the rules?" Asked Mrs. Yaoyoruzu

"Who ever comes up with the best prank wins!"

"Okay! have fun Izuku!" Cheered Mitsuki.

The more the children learned about each other, the more they hated Endeavor. They also talked about Izuku's dad and about the bully in the the food and drinks came, the children waited around Izuku after the moms left. Each had their own fruit juice punch. Mei raised her fruit juice, an apple, and cried out "Three cheers for the Boss!"

Izuku blushed.

Endeavor knew something was different when Rei and Shoto came home. Even his other children felt tense. Rei seemed oblivious to the dark smirk on her youngest child. The boy had numerous bags that he didn't have when he left.

The next day Endeavor woke up to his wife giggling. His shampoo felt different that day. His breakfast tasted funny. The mans Hero suit was making him itch. It was only when he arrived to work and a new Sidekick started laughing that Endeavor asked what was wrong.

"Go look in the mirror boss!"

In the mirror, Endeavor saw black whiskers on his face, a black circle around both of his eyes, and his hair was pink.

Going back home after canceling his patrol of the day had Endeavor in a foul mood.

"Shoto! It's time to train!" Yelled Endeavor to his youngest that was playing with his siblings.

"No!" Shoto crossed his arms. "Make me!"

When the man got close enough from stomping towards the boy Shoto yelled out a "No!" and kicked the hulking figure. A startled, high pitched squeak came out. Behind the man, he could hear his wife gasping. With his eyes still wide he saw his youngest child pull out a little marble. "Run! Scatter!" Yelled Shoto to his siblings as he threw the marble onto his fathers forehead. It cracked. Then a smell seeped out of the marble making the Number Two Hero cough and gag.

"SHOTOOO!" Bellowed the wounded Hero. "YOU'RE GROUNDED!"