To relieve the stress of office life, she finds release through the tongue and penis of a handsome pet she keeps at home. Ayumi Shinoda, 29 years old. In her youth, she attracted constant attention, but in her late twenties, mounting work pressure has left her burdened with daily stress. Possessing a beautiful big-titted body, she decides to keep a masochistic handsome man as her pet to alleviate her suffering. Wearing a collar as her devoted service dog, he undergoes reverse training and penetration. Within the tight confines of her 1LDK apartment, she opens up her life filled with lustful desire.