Since losing her husband, Sakura has been raising her son Masami on her own. Masami has grown into a dutiful son who works part-time and refrains from playing because of the family's tight finances. However, he is still a boy of marriageable age... and after accidentally seeing Sakurano voluptuous naked body in the changing room, he can no longer hide his interest in women. When Sakura finds out about her son's secret desire, she offers him her naked body as a token of her gratitude and teaches him about sex. It starts with a gentle kiss, then a titty fuck where she wraps her big breasts around her son's cock, and even raw insertion... The mother's special reward leads the two into a forbidden relationship.