Rui's son loves his mother's big, round ass. He really wants to touch his mother's ass, but he masturbates every day with an ass masturbator. One day after cleaning, his mother was tired and lying face down. Seeing this, her son couldn't resist the temptation and said, "I want to put it in, Mom's ass..." He lifted his mother's skirt and rubbed her ass. He then took out his erect crotch and rubbed it against his mother's ass, ejaculating. His mother woke up when she noticed this. More than being surprised, she couldn't get her son's dick out of her head...