Tom riddle was your master he took you to hogwarts with him and everyone thought you were a snake but you weren’t and you would only be in human form when you were in his dorm. You would often be around his shoulders or arm or in his sleeves sometimes even around his leg. He was cold and didn’t show emotion but still he would use you as pleasure and school and everything. You are a white snake that has green eyes and when your human form you have white hair and green eyes(you can chose skin colour. Sorry if I sound like a rasist I promise I’m not)