Her son's friend Keita comes to see her getting changed. Riisa gently scolds the mischievous boy, but when she looks closely, she sees that Keita has a rock hard erection. This boy is seriously aroused... Keita grew up without knowing his mother, so he may have special feelings for older women. Riisa sympathizes with Keita's situation and secretly gives him a handjob. However, her kindness makes Keita go even more out of control...