Η πουτάνα της ετεροθαλούς αδερφής μου απατά τον γκόμενο της μαζί μου

My stepsister is a bit of a slut, and she's almost always wet and horny. One day he saw me in my underpants and suggested that we fuck. As the good stepbrother that I am, I accepted her proposal and invited her to go to a motel.