I Fucked My Stepbrother after Finding Him Masturbating with a Plastic Pussy

A DELIVERY MAN ARRIVED AT OUR HOUSE AND I SAW THAT WHEN HE RECEIVED THE PACKAGE, MY STEPBROTHER HAD A VERY STRANGE ATTITUDE. I DIDN'T THINK MUCH OF IT, BUT SOME TIME LATER I HEARD STRANGE NOISES COMING FROM HIS ROOM. I WENT IN WITHOUT KNOCKING AND FOUND HIM MASTURBATING WITH A PLASTIC PUSSY. I COULDN'T HELP MYSELF AND WANTED TO SHOW HIM WHAT IT FELT LIKE TO FUCK A REAL PUSSY.