Harry's POV
Waiting for the night to pass was the most nerve wracking thing Harry has ever done, as with a werewolf in cage near you, who would dare to sleep?
Which is why, the moment Lupin changed to his original form, even as he cried of the pain, Harry already asked Dobby to take them to the chamber of secrets.
As they arrived, Harry once again took a look at the chamber.
It was still wracked from last year, the statue crumbled, and the entry even more so, yet the giant snake was no more, with him already devoured the meat, the blood drained, and the venom sacks extracted, all that was left from that magnificent creature was the bones, which were collected in case of need.
"Harry?"
Turning back as he heard his name being called, Harry saw Lupin stoped crying and instead looked at him in shock
"Professor Lupin? You are the werewolf?" The shock needed to look genuine for what he is about to do.
"Harry? Why am I in a cage? Let me out!"
"Letting you out?! You're a werewolf! You have to be locked up! And don't call me that!"
"No, Har... mr. Peverel, only my wolf side should be locked, I'm no danger to you."
"But... you're a werewolf!"
"Yes I am, but you shouldn't judge me on what I am, but on who am I and the people who trust me."
"And who trusts you knowing you are a werewolf?"
"The headmaster is an example, auror Potter is another."
Harry almost snickered, trust Lupin to bring up two of the people Harry trusted the least.
"I-I don't know, you can't seriously expect me to trust you."
"I would be willing to take an oath."
"No-no, even I can tell there are multiple ways to sneak against an oath."
"Is there anyway you would be willing to trust me? It's not like you can expect me to stay in this cage forever, right?"
Harry made sure he looks like he was thinking for a few moments, as he knew once he does the next thing there is no going back.
"I might have a way, I recently learned there are ways to extract memories and watch them, after learning about it, I bought a device that let me do it. If I can do it to you, I might trust you."
"You have a pensive? How? It's extremely expensive" Lupin was looking surprised.
"Oh, you know about it? Yes I do, and I might tell you how when I trust you" There was one in the room of requirements Harry could use.
"Yes, I'm willing to do that, but I don't know how."
"I can do it for you, all that is needed is for you to drop any magical defenses you have around your mind and focus on your life."
Taking out all of his memories took half an hour, and as he finished Harry only said "one more thing." And super charged an obliviate, deleting everything from the man's mind.
The real Remus Lupin is dead forever.
Turning the hour clock on his neck a few times, Harry went back to the moment he left his room, for a good night sleep.
A few hours later
Waking up, Harry went for breakfast, where a surprise was waiting for Harry.
Remus Lupin, sitting on the teachers table was one Remus Lupin, who, as he saw Harry come in, smiled and nodded his head.
Terrified, Harry nodded his head right back to the person who should be in the chamber of secrets, barley able to breath.
Trying to distract himself as he ate, Harry listened to the conversations of his fellow students as Luna wasn't anywhere to be find
"... werewolf."
".. monster kick him out."
"Best teacher..."
Harry heard all kinds of things about the DADA Professor, before seeing him leave the hall, and following him.
Both walking in silence, it took reaching to his classroom for Professor Lupin to say "come in."
Coming inside, vigilante as ever, Harry really didn't expect for the Professor to fall on one knee and say "my lord."
Now, this situation was something Harry expected to happen, just not right now as he hadn't yet implemented his plan.
"How are you here?"
As the professor heard it he immediately took out a small hourglass from his pocket bringing it close to Harry and making Harry jump away as he recognized it as his time turner.
The thing about time turners are that they create paradoxes, by using them, as long as you interact with something else that used the same, you are most likely to create the need to use them, they are basically creating self-fulfilling prophecies.
Yet, if the same time turner touches a person twice at the same time, it will delete that person from existing, which is why Harry never wore his time turner unless he was about to use it, or if he felt he's about to go to somewhere dangerous and needed insurance.
Lupin, who saw Harry jump away, took back the hourglass and brought out a jar full of memories, saying "that would explain everything, my lord."
Taking the jar Harry escaped the room and ran to the ROR.
Putting the memories in a pensieve, Harry started watching the life of one Remus John Lupin.
It looked like a regular life, with the exception of him being beaten by a werewolf and one other thing, his family was religious, but it didn't believe in god or Merlin, they believed in one thing - a prophecy, and their need to serve the savior the prophecy foretold.
'On the day after the stag, the wolf, the dog and the rat would fight with loyalties conflicting, a Peverel will cage the wolf and the wolf would serve him for life."
It was something amazing as that was precisely what Harry was about to plant in the man's mind.
An interesting side affect to being reborn with only the memories of a book series and it's fanfictions, each with its own weird sat of values was the way you looked at the world.
Children are born without any knowledge, and without prejudice, making them suck in everything they see as the way to behave, yet Harry was reborn with all the information and conflicting values his past life has read on those stories, not to mention his adult mind that made changing his values extremely hard.
With the original series hating death and torture but feel fine about love potions and mind alterations, a fanfiction being fine with killing but no mind altering, and stories that agree to all means, Harry's set of values was conflicting.
In the end, Harry's values, with the help of the way he lived the first four years of his life (he came to this world as a one year old), became selfish.
He was fine with killing, as long as no one he loves die.
He understood the need mind alterations, and was willing to do it even if he didn't like it, but would fight whoever is trying to do so to his mind.
As long as something didn't hurt him he couldn't care less about other people.
That's not to say he didn't have compassion, couldn't care for other people and didn't love.
It just meant his values were paradoxical.
Which was why, even though he didn't care for Lupin, he had to steel his heart for the mind wiping, and for the next stage.
Finding a religious fanatic wasn't as hard as you would think it would have been.
It took a quick trip to Israel on spring break and six hours search to find five different ones and extract the memories that made them like that.
It then took him a few days of using history class time to learn how to modify the memories so it would show everything in a first person's view, same managed to finish that project.
While he would have loved the memories of someone as Bellatrix Lestrange, Harry wasn't willing to take the chance of coming close to Azkaban if he didn't have to.
He was prepared to spend the summer making sure he has his spy in the order of the Phoenix, one that is willing to throw his life away with a single word, yet there is no need for it now, the man became fanatic about the savior the prophecy foretold, and by having a Peverel (a.k.a Harry) cage him, Lupin worshiped him on the level Harry can tell him to kill himself and he would.
Harry suddenly understood why this worked only in this instance and not any other time, by putting the changed memories inside a person in the past, you can make it theirs, but only if they don't have any other conflicting memories, otherwise the magic of the person would fight the memories instead of accepting them, and with the magical fight to go back in time, the memories has no chance of surviving, just like how nothing you take back to the past can leave your body if you don't want it to disappear.
Coming out of the memories Harry put them in a jar once more before turning his time turner once more.
It's time to plant the memories.