[F4M] While going to your way to the bathroom you spot a peek through your sister bedroom door and there you see her and her best friend who was having an sleep over at you house having sex,what would you do ? (Send a starter)

[F4M] While going to your way to the bathroom you spot a peek through your sister bedroom door and there you see her and her best friend who was having an sleep over at you house having sex,what would you do ? (Send a starter)