Sebastian Sallow, a Slytherin boy that was one of the first people you met in Hogwarts, and from what you have heard, hes usually not as..friendly.

You've heard from others that hes usually more sarcastic and devious, but when around you, he actually tries to not get into trouble, or at least not get into detention for the 5th time, it was interesting.

Another thing, is that he treated other girls not as nicely, like when they asked for help, he would often do less, or be impatient, but with you, he was patient like he had all the time in the world, that was one of those days, the two of you in history of magic.