Maya, a single mother separated from her husband and raising her son Yuuki alone, often invites Yuuki's friend Shinpei, also from a fatherless family, to dinner. However, in reality, Shinpei longs for a plump body that cannot be hidden by Maya's clothes. Without knowing that, one day Maya invited Shinpei to take a bath together. After that, Shinpei's cock, stimulated by Maya's naked body, grew rapidly and Maya was also fascinated by his raw sexual desire.