Disclaimer: I do not own Harry Potter. No, no, some other famous person does. I will tell you that I own Hazel Potter, since she is my own creation!
Chapter 1: Teach us DADA
"Good afternoon Mr. Potter and Severus, I assume your trip went well?" Professor McGonagall asked.
"Bloody Hell, I still hate Floo Powder!"
"Language Mr. Potter." Severus said.
"So what are we doing here Headmistress?" Harry asked.
"Well you see I was looking through the Hogwarts history book, as all good headmasters should do, and I came across this." McGonagall held up the book and it flashed the pictures and words below: Professor Harry Potter DADA 1976-77, Professor Severus Snape DADA and Potions (Substitute).
"WHAT?" Harry and Snape both yelped. Snape was hardly ever surprised- well not enough to show it on his face.
"Wait, why am I a substitute!"
"It appears that year we didn't have the 'right' teachers for the jobs- let alone to say none were available at the moment. I am sending you both back in time to go and teach Harry's parents 7th year at Hogwarts. Do me a favor, and try not to go and risk changing our past and future. Especially you Mr. Potter. Severus, I don't think I need to say it twice."
Both men nodded quickly, not wanting to see McGonagall fuming.
"What about Ginny and the others?" Harry asked nervously when he thought about Ginny learning the truth about where he was going.
"I will alert the family. Now off you two go." They were both about to object, but the world started to spin around.
There was no turning back now.
They landed into Dumbledore's office- the old man who was still alive back then.
"Now who are you two?" asked a white bearded man gasped; you could see he was in shock, since his muggle candy was almost about to enter his mouth.