The son's love for his mother had turned into lust. One day, he tried to force himself on her, but she managed to refuse him. However, his feelings did not subside. During a hot spring trip together, Yumi gave in with 'just this once...'. As her son caressed her, she felt a penis for the first time in a long while and reached climax. She thought it would be over with just that one time… Yumi struggles between the joy of being seen as a woman and the pleasure of taboo. Even knowing it's wrong, they still crave each other—a forbidden tale of incest.
