In a universe far, far away. Harry Potter was in the 7th corridor of Hogwarts by the picture of a wizard imperiously having trolls dance in tutus. In this universe, everyone had magic. True about 70% are squibs or squib like for the other nonhuman races. 15% are witches and wizards, the same for the others also. 10% are high end mages, Dumbledore, Gellert, Voldemort level. The last 5% are split up with no set amounts. They are nulls or 'demi-gods'. The nulls cannot be affected by any magic. Harems, incest, etc was a somewhat rampant happening do to the control magics.
The Demi-Gods are in this way. Demi-Gods are 5 to 10 more times powerful than Mages. Mages are 5X more powerful than Witches, who are 10 times more power than Squibs. The scale on a 5,000 point scale would be Squibs are 10-49. Witches (and Wizards) are 100-490. Mages are 2,450-4,350. Demi-gods have never truly been measured as they can easily fight 5 high powered Mages.
The thing is that usually at most their would be only a few of them in the world. The thing is that in reality there are 3 to 7 alive at anyone time. So they are also the oldest or youngest, but always the strongest. Magic was a bit sad and Gaia talked with the Fates and came up with a plan.
Lily had done things to protect Harry, but it was the instant the James died and the slave magic disappeared. That she had an epiphany. The quick runes she drew and used her blood-magic to fill did what the 4 Deities wanted. Harry Potter was not like the others. In the department of mysteries, the wimpy Love room exploded. But not in an ending way, but in a growth way. All the evil people within 10 squares miles died, the rest were just knocked out. It was not all, but all those there. After that evil and hateful were uncomfortable or in pain being down there in the DoM. But even then, some like the feeling (masochists).
Lily's magic, her soul, and mind went into the baby. Because of this the broken off part of the shredded soul of Tom went into the scar before it could heal. Lily absorbs it. Lily would have bonded with Harry, but her 'eating' the soul shard stopped her. Her magic was no longer able to combine with Harry. The thing was that Harry was a Null. But the runes, gods, and the love of Lily changed him. Little magics, potions, and things like that worked fine. Death was not as happy, but she agreed that he could be her master in this universe.
Time passes. This universe was known as the 'Control' universe. People were imperioused every day, but they never lasted more than 6 hours. So not quite as useful, except for assassinations. But with the power differences, it was maybe once a century that an assassination worked on the Mages and Demi-gods. More often than not, the squibs had it done to them to be sex slaves. It was Summoning that was a no no that all agreed on after Atlantis was destroyed by the Summoned Demon Lord. That still did not stop everyone.
They just summoned succubi, imps, and minor like demons. That is were the Veela come from. Weres and vampires were from other dimensions, including the Dementors. Goblins, Oni, Merfolk, Lamina, Kitsune, Nekos, Giants, Sasquatch/Abominables, and the rest were from other realities. After a number of wars, it was decided to let each group do its own thing, in certain areas. The others were usually Elementalists and that is why the more live and let live philosophy came about. The 10,000X more numerous 'humans' still looked down on them a lot. It was the rare human that did not.
Back to slave magic. It had to be accepted without coercion to work. The Squib born children were never told about the hidden clauses in contracts. Many ended in brothels, but some married into families. Lily was tricked into wedding James from Sirius and Peter telling her that that was why Alice was marrying Frank to get ahead, as the Ministry never allowed squib born to hold anything above menial labor, unless married to a pureblood or Lord. Many had marriage, consort, concubine, or mistress contracts. Once she signed the contract, she became the sex slave of James and his friends (that was why Peter and Sirius did it).
It was illegal to use the sex slave clauses (but not the obedience clauses) on anyone but squib born. Families could enforce various clauses except the sex slave in any contract with anyone. The difference is that only sex slaves can be forced to bed others not involved in the contract and if stupid, could be families, but no corporations. Also Family is immediate like parents, siblings, and children. Not nieces, uncles, etc., but included half siblings with other women. I.E. had to be the male family impregnating the female other.
Back to Harry Pacing. Lily was worried for Harry. Thanks to her impute, he was 1 of the nicest 'people' on this planet. The non-humans always showed him respect as he had always showed them. Just like his mother. Harry listened to the voice in his head quite often. It had protected him by teaching him magic at the Dursleys. It showed him how to hide, protect, and attack, with his mind. It was this that made him cry. He found out she was his mum. He learned about the contracts from her, too late for became the sex slave of Ron, his brothers and sister, Molly and Arthur as the contract said family. This is why he was up here on the 7th floor.
Dobby and Winky that were now his personal elves and told him about a room that could change into anything and give him answers. Lily had become depressed after Hermione's fall. She now regretted not taking over Ginevra's body back in 2nd year, when most of her soul was gone. Lily was not really paying attention to what Harry was doing until Lucius was sacrificed into a summoning circle.
Lily was shocked as she read the runes. She cried to herself as her son sacrificed a total of 30 Death Eaters to get 30 slaves. It was true, but not. He sent his mind out into the other realities and sought out girls that had nothing to live for and were close to or dying. The sacrifices were to to not make sex slaves like Lily thought, but to rejuvenate the women. The oldest was 281 and the youngest was 20, but like all things. There was a slight interference.
Death got together with Magic and made a deal for the girls. They subconsciously gave Harry info on how to make all the girls and 'Headmistress' of the Up-skirt School of Magic that Harry's name came out as attending. Barty had thought the name appropriate as he was getting lots of imperioused sex with the girls who love skirts at the school.
The oldest was told that he needed a Headmistress for the school he supposedly attended. He told all of them that he would bound with them. If just themselves as a best friend and protected member of his House. If they had someone else they wanted to come, then the bounding would be closer to being a sister.
She was dying from old age. Her love of life had died when she was young. Her much younger sister (30 years younger) was never married and only loved her and her dead love. But they also had best friends with benefits that had been married and had children, but no longer had a spouse or living children. All 4 accepted. But what Harry did not realize is that each 'binding' increased the bounding. So much closer than being a friend with benefits, more like a wife. Each time it was 3 or 4 members after that. So Harry became, with his mum, soul bonded to all 30 women/girls.
Harry had done 30 for the simple reason that each school had a Head and 30 students. The List I was thinking of would include the Phoenix, Storm, and Mystic; Sekirei #1, 7, and 108; Kara Kent (Supergirl), Galatea (Power Girl), Chloe Sullivan (Watch Tower), and Martha Kent (Red Queen). [I lost the thought of who that was to be with the sisters and lovers, but know it was a major figure when younger.