Tsubasa had long been captivated by Yui, his childhood friend's mother. One day, while applying for a passport, he discovered through his family registry that Yui was actually his biological mother. Wanting to confront the truth—that Yui was both his adoptive and real mother—they planned a hot spring trip to talk things through in private. But there, they encountered another woman staying next door who revealed she was also Tsubasa's real mother—and secretly in love with him. Forbidden desires began to stir. Overcoming reason, the two mothers and son shared passionate kisses, caressing Yui's big tits as they indulged in intense incestuous lovemaking. A lust-filled journey unfolds, where taboo desires and creampie-filled encounters ignite in the heat of the hot springs.