"Master?" Harry awoke from the pain in his head, it was gone in a second. Aunt Petunia had hit his forehead with the iron frying pan. He did not remember anything else. She had picked up the salted spices and vegetables he was going to cook. "Master!" Harry looked at the creature in the cupboard with him. He did not panic.
First it called him master. Second it was no bigger than him, but had large floppy ears. It was intelligent and definitely not human, but obviously female. "Hi can I help you. You seemed to have healed me somehow, but you are calling me Master!"
"Yes Master, you might not remember Shilly, but I was your mother's personal elf. I am following her last commands, though I be dying." Harry's eyes grew large.
"Can I stop you from dying?" The elf, Shilly nodded her head.
"I have seven things to teach you, but your mum's friend Pandora told her that we would live, even though I was already dying. I have much of her magic in me, as well as many memories and instructions to help you. I had to wait till you died, before I could do anything. The reason was the vile wizards soul anchor was in your scar, after killing your parents." Harry was processing. Magic was real. His parents did not die drunks in a car wreck.
"Ok! What do I need to learn?" She smiled and her eyes turned green, just like his for a moment.
"It is seven rituals to protect you and bind others to never betray you, though the last will move her beyond to be with your dad. I will become your devoted, loving girl. I will be a girl, so the elf disease will not kill me. But I will only live as long as you do. But I will also only be able to have your children." Harry was shocked.
"You will be a slave? But that's not fair."
"Master, I have lived two hundred plus years. I would have lived another three hundred if not for the disease that will kill me. Your doing that ritual, will make us both powerful, but I will live a full life as your concubine and love. I will protect you as you protect me and others. Pandora saw you would be a great Hero and also save her daughter. She knows something will happen, near Luna's end of ninth year. Luna will be bound to you, but she will be one of your wives. The magic world has a thing about it's House names needing a wife to be politically active."
He was a bit shocked, but being in a cupboard, he had not really learned what was normal out in the world. After all the history they had so fare was Greek, Roman, Egyptian, and Chinese. All of them had multiple wives, slaves, concubines, and consorts. "Your family has Potter, Gryffindor, Le Fay, Peverell, and will have two others, maybe three, according to Pandora. That does not include a few where you marry the only female, so become lord of their House with them being the Lady."
Harry nodded a bit. The year passes with the Dursley's forgetting about Harry. He went to school, did excellently, ate and exercised well. The Harry hunting stopped as they all forgot him. Each month was a new ritual. He was now eight, heading for nine.
The rituals made him (1) healthier (and more fanciful). They made him (2) faster and more agile, (like hand coordination and physical speed). They made him (3)stronger (and giving him more stamina in all ways). He became highly (4) resistant to magic from an outside source, so others healing spells not work good. His physical body became highly (5) resistant to poisons, venoms, and drugs, (this includes potions), so a bit of a down side.
(6 was actually done second) made his secretions (blood, sweat, tears, saliva, and cum including pre-cum) bonding elements that made the person more than loyal. Harry was not told about it being a physical, mental, and emotional slavery. Harry was too young to understand 'bind them to be loyal.' (7) Shilly grew up into a beautiful looking girl, with slightly pointed ears, long flowing red hair and emerald green eyes. She looked much like him. She pointed out that all records said she was his twin. Only the old goat whiskered intereferrer, his godfather, and Pandora will know I am not your twin. But any spell will say I am.