Mai Ko Kashiwa lived with her daughter and son-in-law. Even after several years of marriage, the couple remained deeply in love, and Mai Ko sincerely rejoiced in their happiness. But suddenly, their lives took a turn. After undergoing fertility testing due to their inability to conceive, the daughter was diagnosed as infertile. Unsure of what to say, Mai Ko was stunned when her daughter made an unexpected request—she asked her mother to become a surrogate. Though anxious about her age and limited chances, Mai Ko resolved to do it for her daughter's sake. Under her daughter's watchful eyes, she began intimacy with her son-in-law. Nervous at first, she gradually warmed to his gentle yet increasingly passionate touch. Prompted by him, she touched and sucked his penis. A deep ache stirred within her womb, pleasure building uncontrollably, making her crave being filled. Yet this act was solely for her daughter—she must not enjoy it. Still, Mai Ko steeled herself to receive his sperm. The three of them prayed together for a new life to take root. Days passed, and Mai Ko found herself unable to sleep. Recalling the conception sex with her son-in-law, arousal surged, wetness flooding from within. Touching herself with fingers no longer satisfied her. Her body, now lustful and craving his cock, wouldn't calm no matter how fiercely she masturbated. Lost in ecstasy, she failed to notice her son-in-law watching. Unable to resist, he rushed to embrace her and placed his already-hard cock into her hand. Though her instincts screamed to take him, Mai Ko barely held back, instead opening her mouth to catch his thick, hot cum.