I bought the 'oil that makes you horny when applied' that people are talking about on the street and wanted to try it with my girlfriend, but I decided to play a prank on my stepsister to see if it really works. It seemed to work even better than expected, and she transformed into an incredibly slutty person. She straddled my face and sucked my dick until it was covered in saliva, squeezed it between her tits, and kept sucking until I ran out of cum (laughs). Six-part series of perverted pranks on six stepsisters.
