This role-play is performed by adults. 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 had a love for his mother that was more than family, and they spent 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...