Kaori Matsushima is a 40-year-old widow who lost her husband and lives with her husband's stepchild. Her feelings of affection as a son gradually turn to love, and when her son's friend invites her to have sex, all she can think of is her son's face. After a trivial incident, the two realize their feelings for each other and gently press their lips together, and Kaori's ripe body trembles with joy in this forbidden mother-son sexual encounter. The stimulation of her beloved son's thick, sturdy cock fills Kaori's vagina to the brink of pleasure, and she climaxes with a happy creampie.