New and Mother-Child Sorin Engeki: Mother and Child #4, Kohyakuai ISHIHARA
"Kenchan, you had sperm in your pants. You don't have much time to study, do you? Well, my mother's going to do it." It was a pure expression of affection made by Kohyakuri's maternal instinct. you don't even know that you're going to fall into the deepest of forbidden love...