A (maybe and hopefully) different kind of time travel prompt

So, there are a bunch of stories where the Horcrux comes alive and teaches Harry stuff, right, like the one where it comes alive in sixth year and trains him in Runes. I forgot the name of the fic, but the point is that we've all seen stuff like that right, but what if the same thing happens, except with a future Harry? Harry sends his soul back in time and it gets rid of the Horcrux, destroying it since it has no physical anchor. Instead of merging, the badass adult Harry who's almost as powerful as Voldemort sends his soul back into his younger self's body, but instead of taking over, it becomes another voice inside the current Harry's head. Then, it becomes like a Riddlecrux and Harry mentor fic, except with an adult Harry.

Harry's hand trembled and he wasn't sure if he could keep standing much longer, but when the smoke over the battleground cleared, his opponent could be seen lying unconscious on the ground.

"You did it, Harry! Well done!"

Harry sighed in relief, his shoulders slumping. He hadn't been sure he could last ten seconds against the older boy, but the other Harry's training had paid off.

"Now, quickly before somebody tried to come through this secret passageway."

Harry wasn't sure what the other Harry meant, his thoughts were coming slowly. Now that the fight was over, he was feeling tired and even a little sick. Did he get hit with a curse and not notice?

"No, you didn't. It's just the adrenaline wearing off. What I mean is that you need to kill him quickly before someone comes to investigate the sounds of battle."

Kill?! Harry didn't want to kill him!

"Come on, Harry. You knew that people would have to die to save the world from Voldemort."

But they were meant to be evil people. People like Voldemort himself and other people wearing dark cloaks and cackling madly.

"Harry," the voice in his head said sadly. "I told you, evil doesn't really flaunt itself like that. Even Voldemort could be charming. Marcus Flint is just as bad as the worst of them."

But now he was just an unconscious 6th year. Harry had played Quidditch with him, for goodness sake!

"Do you want me to tell you some of the crimes that Flint committed in the future? What he did to that family of Muggles?"

But he hasn't committed them yet!

"Harry, you trust me, don't you?"

Harry did trust the other Harry. He was Harry too, after all, but even so...

"I helped you escape from the Dursely's. I protected you from the machinations of Dumbledore and Fudge and half a dozen others. I've taught you magic that other could only dream of. Do you know how many other first years could take on and defeat a sixteen year old?"

Harry closed his eyes tightly, desperate not to show the tears that we're threatening to fall. He owed so much to his older self and he was started to feel ashamed...

"No, Harry, I'm sorry," the voice said. "Don't get upset. I'm just forgetting how young you are, but the more we do now, the less innocent people I the future will suffer."

But that was just it. That future hasn't happened yet. Harry didn't want to act like a soldier fighting in a war that hadn't even started yet.

"You could just cut off his wand hand, that would make him less dangerous when you have to fight him again."

But Harry was resolute. His older self's plan for the future had been so compelling, but faced with the reality of what he had might to do to achieve it, Harry suddenly didn't want to the country.

"But Hermione would be the actual Minister, you'd just be the power behind the throne."

Harry just shook his head. He walked over to the boy who he had been fighting just a few minutes before. Using one of the spells that his internal companion had taught him, he checked that the teenager was still alive.

"You're just making things harder for yourself, Harry."

Maybe he was right, but Harry didn't want to turn into a monster.

"Is that what you think of me?"

Harry didn't know what to say to that.