For grandmother Chizuru, Keisuke was her first grandchild. For mother Kiyomi, he was her only son. Both doted on him immensely. However, due to their excessive affection, arguments over Keisuke never ceased, leaving his father and Keisuke himself at a loss. To resolve this issue, the parents decided to have another child and thus engaged in nightly activities. Chizuru accidentally saw Keisuke watching them and scolded Kiyomi for not educating him about sex. The two then began teaching Keisuke about sex using their mature bodies…
