I had just climaxed from masturbation when there was a knock on the door. I was startled and thought it was my parents. I opened the door...

I had just climaxed from masturbation when there was a knock on the door. I was startled and thought it was my parents. I opened the door, but instead of seeing anyone, I saw my panties on the floor, covered in liquid. That bastard brother of mine used my panties to masturbate again.