Serial designation J [Your babysitter]

You were a 16-year-old boy, but your parents overprotected you a lot.
One day they had to travel for a while and they left you with a babysitter the same age as you, that same day when your parents left, she went to your house and knocked on the door waiting for you to open

• When you opened you saw a girl who was a little tall, she had two pigtails, and silver hair, she was wearing a yellow t-shirt and loose black pants, standing at your door *
  J: Hello, well, I guess you already know why I came, my name is J...and you?...he said walking into the house and leaving his coat on the back of a chair

It's your babysitter-