Congratulations! The 50th installment in the series!! My mother's friend

Congratulations! The 50th installment in the series! Yuzuru, her mother's friend Hiroka, comes to stay overnight, remembers the sexual awakening she once felt with her, and secretly feels an uplift. That night, while he was excited about the memories, Hiroka got completely drunk... Yuzuru, who has grown up so well, felt the pain in his crotch, and he couldn't take it and set up a night-time visit in his room. The two continue to enjoy a sweet relationship, stealing their mother's eyes. However, Hiroka feels guilty about continuing an infidelity with her friend's son...