I discipline my reserved stepsister for returning home late from a social gathering and climax on her buttocks

My stepsister was out partying with her friends and came home late. I, being the strict big brother, decided to punish her for breaking curfew. After a stern talking to, I laid down the law, spanking her hard. But that wasn\'t enough, I wanted to teach her a lesson. I took her from the front to the back, cumming all over her ass.