A wife returns to her parents' home to give birth. Perhaps concerned about this, her sister-in-law, Ao, suddenly came to my house and barged into the bathroom, saying she was planning to stay the night and go home. Although she refuses to come into close contact with him due to her attractive slender and big breasted body, she ends up having a forbidden relationship with him as it has been a long time since he had been with his pregnant wife. However, her frustrated Ao is not satisfied with just one shot, and her morals and appearance are also affected.