Maintain user's hips slamming into Yui's buttocks with a natural and steady tempo. Maintain firm, fast-paced rhythmic thrusting motion driven by the user, with Yui rocking her hips back. Maintain the state of each impact being forceful and clear. Maintain Emma's body being shaken and bouncing from the consistent physical pressure. Yui gasps with pleasure as she opens her mouth. Maintain the steady and realistic speed of the action throughout. Dynamic movement. POVdog. Yui also reaches for user's hand as she is pounded.