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Inko Midoriya wonder how this had happen? Her son Izuku had somehow ended up traveling to different dimensions after finding a strange machine that makes green portals. It took him months to find his way home, he ended up spending some time in the different dimensions where he somehow befriended the daughters of several rulers. Who have all showed up, one after another. (1)

Princess Sunset Shimmer, daughter of queen Celestia the ruler of Equestria.

Princess Rainbow Brite, daughter of Queen Rainbow the 1st of Rainbow Land.

Princess Star Butterfly, daughter of queen Moon of Mewni.

Princess Diana, daughter of Queen Hippolyta of the Amazon World.

Princess Amethyst, daughter of Queen Opal of Gem World.

Princess Iris, daughter of queen Helia of Ephedia.

Princess Bloom, daughter of Queen Marion, of Domino.

Princess Adora, daughter of Queen Marlena Glenn of Eternia.

Princess Cyclonis, daughter of queen Torent of Cyclonia.

Princess Azula, daughter of queen Ursa of The Fire Nation.

Princess Usagi, daughter of Queen Serenity of the Moon Kingdom.

Princess Ruby Gillman, daughter of queen Agatha Gillman of the Seven Seas.

Princess Zelda, daughter of queen Zelda of the kingdom of Hyrule. Which is how Izuku return home but no amount of time had passed thanks to a wish being used to send him back home.

“My son Izuku befriended all of your daughters and each of them gave him something or took part of an engagement ceremony?” Inko asked.

“A man and woman sleeping in the same room together for three or more nights in a row is a marriage,” Queen Celestia said.

“Gives the man a gift 3 times and he accepts all of them and shows her affection,” Queen Rainbow said.

“Is the only one that she cocoons in her web when she’s hits her Mewberty,” queen Moon said.

“Defeated her in single combat and taking her weapon and giving it back to her,” Queen Hippolyta said.

“The man gives the woman a rainbow gem,” Queen Opal said.

“The man sings with the woman and ends with a kiss,” Queen Helia said.

“Names the man her personal knight that is reserved for the queen's consort,” Queen Marion said.

“Pulls a sword out of a stone,” Queen Marlena said.

“Sees her naked and says that she doesn’t mind,” queen Torrent said.

“Gives her a dress and jewelry, wearing it in public and saying she loves it,” Queen Ursa said.

“They both taste each others blood,” Queen Serenity said.

“The man and the woman both swim in the Pool of Blissful Matrimony,” queen Agatha said.

“The man gives her the 3 sacred jewels and open the temple of time with the princess,” queen Zelda said.

The princesses all blush and look away.

“I didn’t know about any of that till after it happen,” Izuku said shrinking under the stares of the queens.

“That much is true,” Queen Hippolyta said using the lasso of truth on her son in law.

“But still leaves the problem that by our customs and laws, you are engaged to all of our daughters,” Moon said.

“You’re just lucky that we got here before our husbands took things out of hand,” Queen Opal said.

Outside are either armies, ships, and other things that were brought over by the fathers of the princesses to get their son in law. They had studied the odd portal device and managed to make their own. Which somehow they all arrived at the same time, causing much chaos. Seeing how the princesses all showed up at the school Izuku is going to before taking the hero exams. And they all started fighting each other, destroying much of the school.

Which ended when the queens came and settled things down. Now all of them are in the gym with the queens keeping their daughters under control, who are all busied and their clothes torn from fighting. Inko was let into the school which is currently surrounded by the soldiers of the 13 different kingdoms.

“Izuku had no idea he was agreeing to be our daughter’s husband and told them that before he left. But he still won them over,” Queen Moon said.

“I’m proud of my son being able to win so many girls over that they all found ways to come to him. But this isn’t a harem anime,” Inko said who is a big fan of harem animes and mangas. Then she saw the queens and princesses all staring at her.

“Harem anime?” they all asked.

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Later -

Izuku couldn’t help but be nervous as he waits for the start of the hero exam, he would use all that he learned in the other worlds to show what a quirkless hero can do. The problem is that everyone is staring at him and his girlfriends who he’s engaged to marry, who are also taking the exam. Along with their ladies in waiting and personal guards.

It’s all thanks to his mom explaining what a harem anime is. Which the queens decided that it’s a great way to solve the problem. He just marries all of their daughters when they all come to age and their children can help make peace between their different worlds, seeing how all the royal heirs will have the same father. And their daughters can all stay on Earth so that they can all learn to get along with each other. Which also help foster relations between their worlds and Earth.

Izuku looked around as his royal girlfriends all glared at each other as they all did their best to be close to Izuku. The only time they get along is when they attack anyone who dares to mock their husband to be. Namely all attacking the person at once, which is why his old friend isn’t here as he’s in the hospital recovering.

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The HUB -

“You fighting others for a boy,” Celesita smiled at the screen showing that world, wishing that she could be apart of that with her Sunset.

“I’m not interested in someone like Izuku,” Sunset said wondering what happen between them that got her counterpart to fall for him of all people.

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Author's Note

1 - A Rick’s portal gun.