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, the man behind her immediately thrusts his hips forwards as his pelvis slams against her ass and his entire cock slides completely into her ass, she simultaneously thrusts her ass back against his pelvis as his entire cock slides completely into her ass. He then moves his hips back and she moves herself forwards as his cock slides out of her ass and they return to their starting positions. , they synchronize their movements to maximize the range of anal penetration. His cock does not exit the ass, ass grips cock tightly, no black spaces between cock and ass