Harry Potter "Manipulating the Wizarding World"

"Dumbledore vs Grindelwald"

I swear my intentions are up to no good.

  "Thank you very much for coming guys" Dumbledore said when he saw Harry's group arrive at his office "oh don't worry" he said seeing how the children looked, visibly nervous, at Amelia and Tonks "they are here because I believe that the information that will be given will be informative" he said, calming the boys' nerves a bit. "We'll just wait for Bathsheda and Severus..." and just at that moment Snape arrived giving the group a look demanding explanations while Bathsheda gave them a classic look of a mother.

  "I called them, Severus," Dumbledore explained to Snape before turning his gaze to the group, "When you got to the hospital wing, Harry, Madame Pomfrey had to change your clothes with a spell, but the watch was in the way, and when she took it off, it attacked her. So she he gave it for me to investigate" he said, levitating the clock and placing it on the desk receiving glances from the guests (Amelia and Tonks) and one especially from Snape, as if he had recognized it"when I manage to remove the spell, I will be able to investigate it further and that's where my worries come from" he said taking off his glasses and looking at Harry making him swallow saliva "there are many spells that although they are not dark, I am very rare; like the one that allows you to contact others, I suppose with your friends with help from your watch" he said, looking at each other's watch "in addition to an elaborate system of Runes for protection, which I assume is caused by that shield that protects from dementors. But I'm curious, and I hope you can take it off" he ended up clasping his hands.

  Harry waited for them to ask him but to see what Dumbledore wanted the long version began "Well I gave all my friends the watches" Harry began acting as if he had nothing to say "then everyone knows what happened last year "he said letting everyone know what he was referring to" then I began to devise a spell with the help of a diary from my father and Slytherin, a spell that would help me see what was happening to my friends, plus I put that system on it of Runes that would create the dome once you are unconscious or at will like my friends did" Harry finished leaving all the adults speechless. Bathseda congratulated him which caused a small blush in Harry and then he began to analyze the clock.

"Mr. Potter, I would like you to supply us aurors with a batch of these watches, and of course they will be paid for," Amelia said after the initial shock had worn off.

  "I don't think so," Harry said sadly.

  "Why?" Amelia asked confused.

  "I'm not saying this for you, Madame Bones, but you know the Ministry isn't 100% trustworthy, so there may be a Death Eater and I used it for evil," Harry explained apologetically, "but you can make some just for those of you." your complete trust,” Harry said, raising Amelia's spirits.

  (...)
  Everyone had already left Dumbledore's office, only he and Snape remained, who had told him that he wanted to tell him something.

  "What did you want to tell me, Severus?" he asked after offering a lemon candy that was refused.

  "You may not have noticed, Albus, but that watch has the same functions as a dark mark," Snape said venomously before leaving without waiting for an answer.

  (...)
  "Very well class, that's all for today" said Lupine, ending the class. They had analyzed the boggarts and that had made some of them turn pale since in the vast majority of cases, they were terrifying creatures.

  "Professor," Harry called.

  "Yes?" asked Lupine.

  "He didn't let me have a turn and" he said looking at the clock "there's still time for my turn" this made everyone see the teacher.