close up of the ass, a woman with a short white pleated tennis skirt, flashes of full white cotton panties under the skirt, ((big bouncy ass)), the woman is walking with a sway in her hips, back view, outside, Create smooth, natural, cinematic motion without warping or deforming, Avoid adding artifacts, hallucinated objects, extra limbs, or distortions or unattached body parts. Produce a cohesive animation with stable details, consistent textures, and clean frame transitions.