Harry and Dudley Start Hogwarts

A plan...

"Harry," Dudley asked, "Do you see anything weird in Quirrel?"
"Yes, as a matter of fact, he has that odd smell, and he keeps being around the third floor corridor."
"I noticed that too. Harry, you ought to write to Mum and ask for dads map. She will understand if you explain... and the cloak, it may be useful."
"Good idea, Dudley, I'll do so now!"
Harry penned a letter to Lily and waited anxiously for the reply. He got his response that evening while reading up on a book about horcruxes.
The owl swooped into the room and dropped a parcel onto Harry's lap. He opened it to find the cloak and map with the words "Be careful, all of you." Harry smiled and pulled out the map. He muttered "I solemnly swear I'm up to no good". The map opened, and next to Professor quirrel, there was a day which read Tom Riddle.
"Who on earth is Tom Riddle?" Hermione asked.
"Lord Voldemort's real name."
"We ought to go to his chambers and kill him now!" Dudley yelled, "He killed your dad, and many others too!"
Harry pulled a book out of his bag. Flicking through, he found a spell that he needed. "Come, nobody say anything once in his chambers and stay back. He will probably try to kill us is he sees what we are up to." Harry ordered, grabbing a potion container, which looked very much like a muggles conical flask. He quickly put a charm on all of their shoes, making them silent while moving.
Outside the classroom door, Harry told his brother and best friend to remain there, as Not doing so could result in one of them becoming a horcrux.
"Be careful, mate. I'll die of you die." Dudley blushed, hugging his brother.
"Good luck, you're a great wizard. Much better than Mouldy Warts it whatever he wants to call himself." Hermione whispered. Harry entered the classroom, feeling wobbly.
"Professor, may I ask you a question about this weeks essay?" He asked.
As the Professor turned around, Harry pointed his wand at his face and intoned "derelinquas illum" which forced Voldemort out of Quirrel and into the flask which he was holding.
"Dear boy, how did you do that? I've tried many a time and not succeeded. How?"
"Latin magic." Harry shrugged. "Shall we find Dumbledore?"
As they left the classroom, Dudley and Hermione gasped at Quirrel, who was no longer wearing a turban, and who was, in fact, rather good looking without it. The four of them went to Dumbledore's office, to which the password was 'lemon drops'.
"Harry, dear boy, so good to see you. And you Professor. I assume you aren't here because of being out after curfew?" All three children blushed.
"Professor, sir, we found that Voldemort was living in Professor Quirrel. We didn't want to hurt him, so we used Latin magic to get him out. He's here." Harry held up the flask. Everyone gasped at the matter inside. It was black and looked neither solid, nor liquid or gas.
"Harry, there is a spell to kill this. I would like you to do the honours, since you extracted him." With this, Dumbledore whispered a spell in Harry's ear.
Harry pointed his wand at the flask.
"Parasitus occisio" Harry said, and four different jets if light left his wand, causing an explosion within the flask.  A minute later, the flask was empty, and the parasite gone.
"Harry, you are a powerful wizard, be warned, a war is coming soon, and you may find a target on your back after this stunt. But remember, help will always be given at Hogwarts to those who ask for it."
Harry smiled at the old man and left the office with his friends, smiling at them both happily.