Maki can't help but feel happy when her shy and bullied son Kazuya brings his childhood friend Junkichi over. Junkichi is actually the ringleader of the bullying, but Maki doesn't know it and begins to close the gap between them... Junkichi, who lives in a single-parent household, has an abnormal attachment to his mother, so he takes advantage of her kindness and pushes her down. Maki climaxes every time he rubs the deepest part of her vaginal wall, which hasn't been touched in a long time. Though she rationally refuses him, her body can't help but feel the throbbing in her uterus...