Married and living happily, housewife Riho deeply loves her husband and looks forward to their affectionate daily sex life. Blessed with big tits, she's highly satisfied in her relationship, but once had a brief encounter with another man over a trivial matter. Unable to forget him, she repeatedly indulges in masturbation. Yet each time, she shakes off the memory and eagerly awaits her husband's return, resuming her normal life. One day, her husband comes home drunk with a junior colleague—and that man reappears. From this moment on, a change begins within Riho. Depicting the deepening adultery sparked by this reunion, the story captures her emotional turmoil through six cumshot scenes, including daily sex with her husband, blowjob with creampie while he sleeps, and consecutive creampie sessions during his business trips.