With her husband away on business, Ririko moved in with her daughter’s family. Though better than living alone, she felt lonely and sexually unfulfilled. She masturbated nightly to cope. She noticed a huge cock’s shadow lurking outside her door, likely her son-in-law masturbating with her. Knowing her daughter disliked sex due to his massive dick, leaving him to jerk off alone, Ririko got a bold idea. She snuck into their bedroom to soothe his giant cock! 'It’s for Keiko and Kunio,' she reasoned. 'Blowjobs aren’t cheating, right?' Woken up, Kunio couldn’t resist Ririko’s seductive body. They fucked repeatedly, even with Keiko asleep beside them. Their bodies seemed made for each other, climaxing over and over when Keiko was away. They couldn’t live without fucking each other.