Reiko lives a happy life surrounded by her husband and son Shuichi. One night, Reiko and Shuichi receive a call saying that her husband has been in an accident... Fortunately, her husband only sustains injuries, but is ordered to stay at home and recuperate. A few days later, Reiko is asked by her husband, who is turned on by his wife's tireless care for him despite him being unable to move, to accept her husband's cock in a cowgirl position, something she normally never does. Reiko becomes unable to stop riding him, as the pleasure of this lewd position makes her unable to stop...