Chapter five (HPOCSI1)

September 1st, 1993.
It was September the first and Harriet now had a basic understanding of Occlumency... she could use the crudest form of the skill, but she was off with her friends now and Percy was enjoying his reading in isolation. Still, Percy decided that it was time to 'feed' or drain people of magic.
There were no changes in power so Percy just drained the first, second, and third years of magic. Percy still needed over a lot more magical power to be at Merlin and Morgan's level though. Percy was pleased with his new level of power, but he needed to surpass Dumbledore and Voldemort for his plans... that would be very difficult.
Percy would take to his new electives with vigor, but he was already more advanced and he was bored in Ancient Runes, Arithmancy, and Care of Magical Creatures with memory retention being very useful in the last, which was essentially a new class and skill. Percy was soon planning to test out of Ancient Runes and Arithmancy to advance to the NEWT-level classes. Thankfully Harriet was informed that she needed to take Ancient Runes to manage the wards of her future homes and she wasn't taking Divination this time around. It caused an argument between Ron and Harriet, but Ron would cave eventually and if he didn't then Harriet would be much better off without him.
Still, Percy was tutoring Harriet in Ancient Runes, etiquette, laws, Potions, and Occlumency and was kept very busy.
----
October 31st, 1993.
While others were off at Hogsmeade, Percy was completing his mastery test. The written, theoretical, and then a practical where he demonstrated hundreds of spells and comprehension of many different fields of magic. It was exhausting, draining, and most people required multiple twelve hour days of silent casting with frequent breaks... but Percy's competitive drive caused him to push the limits of what was possible. He certainly had the raw power and stamina to handle the physical and magical demand.
Finally, after twelve hours, Dumbledore halted Percy's incredible display.
"Well, boy, you certainly deserve your mastery," Alastor Moody said, genuinely impressed with Black.
"Yes, his knowledge is extremely advanced and complete," Remus Lupin agreed.
"Though I do truly loathe him, even I cannot deny his mastery of the Dark Arts and in defending against them," Snape said, grudgingly impressed and also concerned that Black might come after him someday.
The other four were unanimous in their agreement.
"I, of course, agree that Perseus Black no longer has anything to learn from me about Defence Against the Dark Arts or the Dark Arts." Dumbledore added sealing the promotion.
"Very well," Moody agreed. "We hereby recognize and promote you to the rank of Master in the field of Defense Against the Dark Arts and in the field of Dark Arts.
"Thank you, all," Percy replied gratefully.
"We look forward to seeing what you do next," Moody said.
After accepting congratulations and other compliments, Percy departed to rest and read before focusing on his training again.
Once that was done Percy could focus on his classes, his training, his plans to take his OWLs in Ancient Runes and Arithmancy, and sleeping around. With eight months left at Hogwarts, Percy was hopeful that he could achieve some notable results and become much more powerful than before.
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Percy visited Dumbledore at his office later that day, having had a great idea.
"Ah, Percy," Dumbledore greeted. "I assumed that you would be resting up from your test."
"I was but I had a great idea while I was reading..." Percy replied.
"Oh, what was it?"
"How would you feel about taking me as an apprentice in Transfiguration or Charms? Or even both?" Percy asked.
"You would have to demonstrate sufficient knowledge in the fields and pass your OWLs and NEWTs in the subjects... and do so with exceptional grades due to my standards," Dumbledore replied. "Why do you wish to begin so quickly?"
"You're perhaps the greatest master of Transfiguration in the world and if you die before I can learn from you then your skills will essentially be lost," Percy replied. "McGonagall can't truly compare to your knowledge or skill in the art... that isn't an insult to her, but we each have the talents that we're born with or cultivate."
Dumbledore nodded thoughtfully.
"I'll take you as my apprentice in Transfiguration if you meet the aforementioned standards and clear up your schedule more. Test out of Charms and Astrology at minimum." Dumbledore said.
"It'll be somewhat difficult, but I'll do that. I'm already planning to take my OWLs in Ancient Runes and my NEWTs in Arithmancy." Percy replied.
After confirming that Dumbledore was waving his rights to any of his inventions during the apprenticeship, Percy returned to his room.
----
Late June, 1994.
It had taken him eight months of hardcore training, but Percy had reacquainted himself with the OWL and NEWT-level material in Charms, Transfiguration, and in Arithmancy.
Percy had completely mastered several advanced spells and his papers were even submitted for publishing during that time and he was incredibly pleased with the end results. Plus Percy had lost his virginity at a decent age and he was getting plenty of practice.
But why?
Percy really wanted Fleur Delacour to be his wife for House McKinnon and that came with self-imposed expectations... that he needed to rock her world in bed because Veela really were highly sexual beings. He was lucky that he had a previous life of moderate sexual activity to fall back on and was a reasonably gifted lover in that life. That only improved in this life due to necessity.
Percy wanted this life to fulfill all of his fantasies for the Harry Potter universe. Or was it Harriet Potter? Eh, Percy's choice made it confusing.
Once Percy was on the Hogwarts Express and was comfortable he began draining people of magic, an act that saw Percy's magical power grow noticeably due to targeting more people. It wasn't a lot, not compared to Dumbledore and Voldemort's immense powers, but it was another step in the right direction.
----
Percy spent his summer relaxing, studying, sleeping around, managing his political, financial, and noble duties, and casually tutoring Harriet some more. Thankfully Harriet and Sirius mostly wanted to relax. Percy had also offered to ruin the Dursley's lives for Harriet, but Harriet just wanted to be done with them all. It took Sirius finding out and convincing Harriet that the Dursley's deserved to be punished for Harriet too agree. The Dursley's were soon arrested for theft, child abuse, child slavery, neglect, multiple accounts of physical assault, child endangerment, and Vernon was charged with embezzlement, fraud, Commercial bribery, and false advertising, and Dudley was charged with several assault charges, petty thefts, and harassment. Petunia ironically would do less time despite betraying her own blood.
Magic was extremely useful for preserving evidence and getting convictions.
During Percy's self-studying he became an Animagus, having unlocked two more boons; the Multi-Form Animagus and Magical Animagus boons. Percy's forms were mostly predatory, they were: the Antipodean Opaleye, a basilisk, a Horned Serpent, and somehow even a phoenix... naturally Percy was incredibly pleased with himself and his good fortune in such forms. Percy was slowly working on mastering each of his new forms.
Eventually, two days before the Quidditch World Cup, Harriet had a nightmare about Voldemort killing Frank Bryce, and Percy took charge... Harriet was sedated and the soul fragment was removed and sacrificed in a ritual invoking Death and Mother Magic... Percy now had all of Tom's knowledge, skill, experience, and even ritual benefits. Percy could also cast the Dark Mark and brand people with Voldemort's mark, which would be very useful for framing attempts.
The Quidditch World Cup itself passed with Percy, Harriet, and Sirius all coming home right afterward and avoiding the drama. Percy would later learn that Ron Weasley's wand had been used to cast the Dark Mark and Percy would explain about the Dark Mark and the Death Eaters to Harriet along with Sirius.
Percy was also reluctant to allow Granger into his home, causing Sirius and Harriet to accuse him of being a pure-blood supremacist.
"Only a little," Percy replied calmly to the accusation. "Muggle-borns like Granger are mostly the reason for all the persecution and hatred. That waste of magic dismisses or outright mocks our traditions and refuses to learn anything about our culture. The Magical World is functionally a different country with a separate government, laws, traditions, culture, and education. Hell, she and Ron Weasley are the reason that you have so few friends or allies and between the two they've driven away any potential allies including those traditionally allied with the House of Potter."
Harriet looked confused by how they could break alliances.
"Most Light and Grey still value traditions and they don't know if you do due to your association with them. In short they don't know if you're an asset or liability to them. No, I won't have that dumb bint in my house and weaken myself politically in the process." Percy replied, angering Harriet.
"Hermione's the best in our year!" Harriet argued stupidly.
Percy exploded into derisive laughter. "She's the best in Gryffindor, not the entire year," Percy said. "She's barely in the Top 5 students after my wonderful and sexy self, Daphne Greengrass, Padma Patil, and Sue Li. You really thought that Granger, someone who spews the contents of books like verbal diarrhea, was the best? I have three mastery's awarded by reputable teachers backed by the approval of the correct guilds! Even Dumbledore praises my skills!" Percy paused. "Granger is merely above average with imitative intellect and more ego than skill."
"Ouch," Sirius commented, impressed by the insult. "Still, that's enough fighting. Percy you can still allow Hermione to visit, but not stay over, and Harriet you can still visit Hermione at her house or the Weasley's if its okay with their parents."
"He still insulted Hermione!" Harriet argued.
"I stated that she is stupid compared to me, which is factually accurate and that can be easily confirmed by requesting your house and school wide rankings for our year. Everything that I said was true despite also being harshly worded. I gave you the uncensored truth so that you could learn and adapt."
Sirius sighed, parenting was hard. "If Percy was lying then he'll apologize to the both of you for every lie."
"Agreed," Percy said, eager to move past this annoying teenage drama.
Thankfully, that placated Harriet despite her still brooding about it for days.
Percy would soon master his phoenix and basilisk form, mainly because he fixated on the two because of them being opposites and being paragons of Light and Dark Creatures. Apart from that Percy would later mimic Voldemort's ability to possess animals and humans.
----
Percy was soon ready for the new school term and he was just killing time until then... and concerning his father due to the insane amount of sex he was having.
"Percy we need to talk," Sirius said in concern.
"If it's the talk then I've already figured that out for myself," Percy quipped, but he sat down.
"You have too much sex and I'm worried about you," Sirius said.
"It's only a few hours a week and I've almost completed my goal of shagging the hottest girls at Hogwarts. Those are memories that I will treasure for my entire life, brag about, and even taunt their future boyfriends and husbands about how I got them first. I'm not a sex addict. I'm only doing this due to a goal that I set to fulfill my sexual fantasies. And besides, I'm using protection... girls are on potions, contraception charms are used, and I'm wearing condoms and still pulling out. I'm being very thorough in protecting myself."
"I still worry!" Sirius said, though he was glad that Percy was being safe.
"I know, but I'm not an idiot and I'm being very cautious. None of those girls families or friends are a threat to me. Hell, I can pretty much kill every student at Hogwarts without breaking a sweat and then start on all of the teachers... only Dumbledore is a real threat to me at this point. In short as long as I don't sleep with any of Dumbledore's family, easy since he only has a brother, or his friends, I'll be completely fine." Sirius was unnerved by his sons casual boasting of his power and skill, but he was glad that Percy was putting in a lot of thought into it.
"You should still consider getting a girlfriend though," Sirius said.
"I will, but for House Black's Lady she has to be beautiful, intelligent, pure-blood, and ideally come from money. Thankfully for House McKinnon the traditions are more relaxed and I could marry a half-blood, or even a Veela."
"You know your grandmother is gone and so is your great-grandfather... you could marry whoever you want." Sirius said gently.
"I know, but House Black's purity will continue as long as its practical. House McKinnon is more relaxed on the subject of blood purity so I can still marry for love there and have the best of both worlds. I'll still likely be called a blood traitor, but I can crush most magicals with laughable ease and humiliate them in return. Granted, I don't really concern myself with the opinions of lesser beings." Percy said, provoking a probing question from his concerned father.
"Lesser beings?"
"Arrogant pure-bloods who believe that they have everything there is to be had; power, wealth, skill, and influence. So assured of their non-existent superiority that they don't ever experience any growth to gain real power. That really applies to most people who waste their potential, which is, amusingly, most people. Annoying muggle-borns like Granger are lesser, arrogantly disregarding our culture as beneath them and alienating the nobility while plotting to 'fix' our 'backwards culture' to be more like the Muggle World, and ultimately proving no different than zealous muggles who want to eradicate magic and our culture and our beliefs. She won't get very far... besides if she or they miss the Muggle World so badly then they can just return to it."
Sirius surprisingly agreed with Percy. Muggle-borns shouldn't be able to step on others rights, beliefs, or freedoms; that was no different than what the blood bigots did to them and Sirius didn't fight so hard for them to be hypocrites.
The conversation died off after that.