Maiko lost her husband at an early age and raised her young child Kousuke on her own. - However, as her son began to resemble her beloved husband, her body was writhing with secret desires, and she continued to release them all by herself. - Kousuke also has a love for his mother that is more than family, and they spend their time hiding their feelings from each other. - And finally, on the eve of Kousuke's wedding, she handles his cock with loving hands, saying, ``Tonight only, my first and last time...'' - However, the love that they had hidden for years pushes them towards even more pleasure...