Three months ago, my son Koichi was introduced to Haruka, his new partner, by his father. From the moment we first met, I was captivated by Haruka's beauty and large breasts. However, the father doesn't care about his son and messes with Haruka every day. Koichi becomes dissatisfied with her appearance and becomes a ball of jealousy. Then, even though she knew in her head that "Haruka-san is my father's wife...", she could no longer suppress her desire and finally went to Haruka's bedroom...