I hope you all enjoy the story Here's the disclaimer: I own only the ideas you do not recognize.
HHH
The trio of pranksters sat calmly eating their breakfast, talking and laughing about a bit of everything. It seemed fairly innocent in nature but truthfully, they were waiting as one by one the teachers entered the great hall through the back door like always. Harry glanced at his watch waiting for it. 10 minutes after the first professor had walked in she 'Sprout' turned red and gold, Flitwick followed seconds later and within a minute McGonagall, Hagrid, Babbling and Snape all turned red and gold. shortly after them, Quirrell Vector and Hooch turned to Gryffindor colors.
The students all burst out laughing while Percy looked at the twins who were laughing with the rest, knowing they were involved. McGonagall seemed to be of the same thought and marched to the Gryffindor table and stopped in front of the twins and Harry. "Remove them now..."
Fred grinned at her, "Why professor, how lovely you are this morning. Way to support the house...what would you like removed?"
She glared at them but none of them even faltered, "Remove the charms...I know you were responsible."
The room was silent as everyone looked at the scene curiously. "That hurts Professor," George said holding his hand over his heart. "How could you think that of us. We would never do something so irresponsible."
She glared at him, the students all laughed since everyone knew the twins would have to be responsible for it. There was no other way it could have happened, sure there were some amateur pranksters, always a few in every house but no one except the twins could pull off something like that on all the professors, especially Dumbledore who was the last to enter and just changed colors. "What proof do you have that we were responsible for this prank," Fred asked using an innocent look that had no one fooled.
She held out her hand which the two looked at, "Your wands if you are so innocent."
"This is against our rights," George declared loudly. "We will not be accused without proof."
She gave him a cold look. "Mr. Weasley your wand..."
"Fine," they said giving them over and she cast prior incantatem and found nothing shocking everyone as the twins grinned at her. "So, do we get an apology professor," Fred asked pouting, "we are ashamed that you would think us responsible."
She looked at them as their eyes shinned with laughter and she realized that they somehow beat the test. She nodded and began to apologize as she had accused them without proof. "I..." she stopped looking at Harry. "I am very unimpressed that you have corrupted a first year and got him to do your dirty work for you." the twins froze realizing they were caught. "Mr. Potter, your wand."
He stood up looking at her innocently, "professor, what have I ever done that would make you assume I was responsible for this? I am a muggle raised student and have not known about magic long enough to be capable of this. I am hurt you would accuse me of this prank."
"Mr. Potter, I taught your father, that look does not work on me. You are part of this..."
Harry pouted at her though he bit back a chuckle at the mention, "Professor, I don't know what my father may have done to make you suspicious of me but he did not influence me at all...I mean I barely knew the man so I don't think I should be asked to preform prior incantatem because he was awesome enough to be still remembered by you so fondly."
She glared at him, "I would avoid letting the twins corrupt you Mr. Potter or you will be spending a lot of time in my office."
Harry grinned, "Aww Aunt Minnie, you just want excuses to spend time with me," The twins grinned at him as everyone else froze unable to believe he had just said that to the head of Gryffindor. Their shock grew since it was easy to see McGonagall fighting a smile.
"Do not call me aunt Minnie, I fear they've already corrupted you."
"You can only corrupt those who are unwilling," he said grinning as she went back to the head table.
Flitwick chuckled as Snape glared at McGonagall for letting them get away with it. "Ahh Minerva, it seems you will have your hands full.''
The twins gave harry very clear high fives as he winked at her. The other students looking at the three wondering how they got away with pranking the professors.