Narcissa Black is in the middle of her two sisters. Bellatrix Black, the oldest and modest of them all. Andromeda Black, the youngest and kindest. The three were raised in a very wealthy family. Their family was known to be one of the most pure blooded family in the Wizarding World.
The oldest, Bellatrix Black, had always been a perfect model for the Black family since she would always be the person to do the things her family mostly approves. The second, Narcissa Black, was always been the smartest from the three sisters, she will always be the one who will keep the peace between her oldest and youngest sister. The youngest, Andromeda Black, is always been the wildest of the three, she was very beautiful, but have always been very childish.
At Narcissa's first year at Hogwarts, she met a boy who was two years older than her, he was also in a family with the very similar beliefs to her family, and that boy's name was Lucius Malfoy.
When she was in her fifth year, Lucius Malfoy met a first year boy, Severus Snape. He was mostly bullied by a lot of students, but the people who would bully him most of the time is a group of four boys that is at the same years as him. Their names were James Potter, Peter Pettigrew, Remus Lupin and her own cousin, Sirius Black. All four boys were sorted into Gryffindor, and she had seem to break her family rules most of the time, since she was very fond of them.
The reason why she would break the rules of her family for this four group of young boys were because of this one boy, Remus Lupin. She always find him very interesting, in fact through the course of time they were starting to get closer and she was also getting closer to her cousin (even though she was forbidden to be with him or talk to him).
Everyone was already shocked about Sirius Black being sorted into Gryffindor and breaking his family's rules, but everyone was even more shocked to know that Narcissa Black was also associating with him and his friends.
You didn't accomplish anything in your previous life. Looking back on it, you feel nothing but regret, and you yearn for the chance to do things differently. As it turns out, your wish is answered, and you are reborn into your favorite fictional world. This time, you resolve to make a change, and you have the means to do it. You won't be content with just sitting on the sidelines and letting life pass you by. You will live boldly and vibrantly, as if every moment is your last.
No matter what it takes, you are going to leave your mark.