Bubble Butt Stefania Mafra Yoga Workout And Masturbates. With a juicy bubble butt like Stefania Mafra, you know she has to do a lot of yoga to keep it in shape. Today we take a look at her workout routine and check that ass up close as she strips down and does some of her favorite yoga stretches. It gets her pussy so wet working out naked that she finishes herself off with her fingers after..