After her son got a job and started living alone, the mother, who raised him single-handedly, looked back on her life and felt anxious, thinking, "Will I end my life as a woman like this?" One day, her son invited her on a hot spring trip. The son's admiration for his mother had long since twisted into a distorted love. Amid the swirling conflict of not wanting to end as a mother, yet also not wanting to end as a woman, the son gets an erection upon seeing his mother naked. Seeing a man's dick for the first time in a long time, the mother's memories of being a woman come flooding back. She takes her son's cock into her mouth and invites it into her secret pussy—a forbidden act. We present a story of repeated incestuous intercourse between mother and son.