Chapter 1 ~I too wish you a very good day, sir~

(y/n) (y/l/n) is a seventeen-year-old, sixth-year student at Hogwarts. (one year above the golden trio)
Being a muggle-born Slytherin, she ain't got many friends. As she is quite sarcastic, but still a great student, she wouldn't have any problems with her grades or teachers, if it wasn't for a certain Potions Master.
She always treated him nicely and respectful, but also pull some sarcastic jokes on him, which irritates the Professor quite much.
Since when are students nice and not way too afraid to joke around with him?!
What will happen during the events of the order of the Phoenix and the Half-Blood Prince, will she save him in the battle of Hogwarts and will they fall for each other? Read to find out! :)