My girlfriend's workout turned into a sexual encounter at the gym

The other day, I met my girlfriend at the gym. She's been working out a lot lately and I could see her body getting more toned. As we were there, she decided to show me her new moves. She started doing some squats, her tight shorts showing off her round, fat ass. Suddenly, she got up and grabbed my cock, jerking it with her small hands. I was surprised but excited. She then took off her top, revealing her big, natural tits. We moved to the back room and she continued sucking me, her fat ass bouncing. Then she opened her legs and I pushed my cock inside her. Her fat ass kept bouncing as I pounded her. It was a great workout after all.