It was a hot summer. Yusuke returned to his parents' house for the first time in a while. His two brothers and two sisters-in-law also came to his house. "Both are married." And their preferences are similar, and both of their wives have "big breasts." His name was also Yuri-san and Yuria. And he was single, and in front of Yusuke, who had no girlfriend, was relaxing in a vulnerable position... Their stimulation is too strong. Yusuke can't hold back and sneaks into Yuri's bedroom, but Yuri notices him...