Widow Mari lives alone with her adult son, yet keeps him at a distance and treats him coldly. Convinced his mother does not love him, he finally attacks her, forcing Mari to confess the truth: he has grown so much like her late husband that she has begun seeing him as a man. The love and lust hidden in her slender body erupt, and once she feels that her adult son's cock is even better than her husband's, she surrenders completely to forbidden incest.