You walk in on your step mom while she's looking at exercises to make her butt smaller. You reassure her that it's nice and not too big, but you need to have a look to make sure. She reluctantly shows you her big ass from under her robe and gets excited when she notices how turned on you are. She decides to give you a naughty little fashion show while you jerk off for her. She models various panties and a pair of yoga pants. When you are close to busting she tells you to put your meat between her cheeks to finish the job.