Yume's younger brother is sick. He divorced his wife a few months ago, so he had to ask Yume to take care of his two sons. Because she was worried about her two grandchildren, Yume agreed. It's been a long time since we last saw each other, now the two boys have grown up. The younger brother, Sho-chan, is obedient, but the older brother, Yu-chan, is extremely naughty. He kept touching her breasts, buttocks and pussy, making Yume constantly horny. Seeing that scene made Sho-chan aroused and his cock quickly stood up, causing him pain. Seeing that his nephew was in pain, Yume treated his nephew by "throwing his cock". Because he had never experienced this feeling before, Sho-chan couldn't control himself and peed on Yume. Because it was all dirty, Yume took Sho-chan to the bathroom. Out of curiosity, Sho-chan continuously stared at Yume's body. She also realized and was partly excited so she taught Sho-chan things that "adults often do". That afternoon, after letting Sho-chan take a nap, Yu-kun asked to sleep with her. With his mischievous nature, he continuously touched Yume's body while she was sleeping. And regardless of Sho-chan being by his side, he thrust his cock into Yume's pussy and made love to her. At night, the two brothers competed to see whose cock was better, and Yume had to be the referee for them. And she compared both of them by... seeing whose cock was better to fuck...!!!