My stepmother is always craving a big dick from my son-in-law.

Tsubaki begins living with her daughter and her husband after her husband is away from home alone. One night, he witnesses his son-in-law Takeshi, who was so huge that he was rejected from having sex with him, becoming immersed in masturbation. Tsubaki, who was sexless, is captivated by the powerful force of her big cock, towering over her shoulder... Tsubaki tells her daughter's fault for its fault, and continues to seduce him day and night. Eventually, Takeshi can't hold back, and even though he knows that he is his stepmother, he dabbles at the seductive lewd behavior...