Sexy Ass in Tight Shorts

Your girlfriend's friend arrives early to go to the gym. She's wearing the sexy outfit that you've always liked and you cannnot stop staring at her big round ass. She confesses her desire to have you, and your instinct is to go for it. However your girlfriend can be home any minute. Are you willing to take the risk? You almost pass on the offer but then you imagine her dripping with sweat during her workouts at the gym...