When Harry Became a Slytherin

What would happen if Snape had been raising Harry as a son since the age of 5? What would happen on his first day at Hogwarts as a student, becoming a Slytherin? what would happen with his dad as his potions teacher?

I do not own any of the characters or the subject of this story. I know the dialogue is not book nor movie accurate but I wanted to make it fit better into each scene. Thank you for reading ^^