Ayano, who raised her daughter on her own after losing her husband in an accident, finds herself living next door to her daughter's family. She discovers that her son-in-law, Takuto, is suffering from a sexless marriage and indulging in nightly self-pleasure. Despite maintaining her virtue since her husband's death, Ayano can't resist Takuto's massive cock. She becomes obsessed with his penis, indulging in it whenever she has free time and serving him with her own orgasms. Meanwhile, Takuto is overwhelmed by his lustful mother-in-law's relentless affection, both physically and emotionally...
