After graduating from university and starting a job, the son was encouraged to live independently, yet he continued spending his holidays secluded at home. Seeing his lonely demeanor, his mother planned a hot spring trip to encourage him to get out more. However, an unexpected turn of events awaited. The son suddenly confessed his romantic feelings for her, seeing her not just as a mother but as a woman. Touched by her slender, gentle mother's presence and pitying her still-virgin son, she gradually began to feel emotional shifts. Their emotions led to soft kisses, then escalated as the son gently caressed her intimate areas. Overcome with pleasure, she lost consciousness as she took his penis into her mouth and guided his manhood into her sacred depths. Their mother-son bond twisted intensely as they became enveloped in pleasure, crossing the forbidden boundary of incest in an act of taboo copulation.