My mother is being raped by her son every night

Yoshie married into a single-parent family home as his second wife. Her husband Kensuke is good for Yoshie, but her only son Takahiro doesn't open up to her, so Yoshie is worried. One day... My husband Kensuke left the house for a few days on a short business trip. Feeling anxious, Yoshie can't hide her tension in her life alone with Takahiro. However, that night, the crust of Yoshie's bedroom, which had been slept quietly, opened gently. Then Takahiro, who has begun to think of Yoshie as a "woman," sneaks into her room...