I am amazed by my stepmother's big butt

I've always been a huge fan of big butts, and my stepmom's is the best I've ever seen. She's got this perfect round shape that just makes me want to touch it all the time. I know it's not very gentlemanly, but I can't help myself. She's got this cute little smile on her face when she catches me checking her out, and it just makes me want to do it more. I've tried to get her to let me touch her, but she always says no. But I know she secretly loves it. She's got this sexy little curve to her body that just makes her ass stand out. I'm sure she gets a lot of attention from other guys because of it. But I'm lucky enough to have her all to myself.