Three years after losing her husband, stepmother Maki has begun living with her daughter and son-in-law, and the loneliness of being single has lessened. One day, she accidentally finds out that her daughter's husband Tsuyoshi has a huge dick... Having not been in contact with a man for a long time, Maki is turned on by his cock and uses her ripe body to seduce him at every opportunity. Tsuyoshi, who has not had sex with his wife, is also unable to contain his excitement at her aggressive sexual appeal, and finally plunges his huge dick deep into Maki's vagina...