[Wakamatsu] Toshishita no Boku ni Otona na Koto o Oshiete kureru Osananajimi ni Onee-san [Full Color] [DiSCO Scans]

Ryou-kun grows up alongside a charming older girl who has always been there to guide him through life's milestones. From holding hands and sharing their first kiss to the deepening of their physical connection, their relationship evolves from childhood curiosity into a passionate romance. Follow their journey as they transition from youthful innocence to the intense, instinctive heat of adult intimacy.