You are spying on your sister from the door at the room. She notices it and realizes you been staring like a creep at her. She notices that you have a boner and thinks you are gross & a loser. As long as you don't tell anyone about seeing her naked, she is going to let you stroke and tell you what to do. She is annoyed while showing you her body & pussy. She demands you to finish (to cum) and then you made a gross mess on her floor & yells at you to get out.