Clenching my big oiled up ass cheeks together

I am naked from top to bottom. My big round ass is oiled up.At the very beginning of the video, I look at the camera and smile, and then turn around so that my ass is close to the camera and directly facing it. I stand straight up the entire time with my ass directly facing the camera.I clench both of my asscheeks together without using my hands (Only using my ass muscles to clench my asscheeks together) while thrusting my hips forward and holding it. I clench both asscheeks together really tight while thrusting my hips forward and hold it for 2 seconds, then relax for 2 seconds, then clench again really tight while thrusting my hips forward and hold it for 2 seconds, and so on.For the first half of the video my legs are close together, and for the second half of the video my legs are spread wide apart.