Very cool short-short story. I really liked this take from the Slytherin perspective. Professor Slughorn and Tonks' Mom did show that not all Slytherins are bad people. I also liked your character's take on the prejudice they have to face just because they are in Slytherin. Great line in there about if this house was so evil, why is it still around?

No spelling or grammar mistakes that jumped out at me.

Brilliant story. Well done.