[Maihara Matsuge] 100-byougo ni Sex Suru Ane (COMIC Penguin Club Sanzokuban 2020-07) [Colorized]

An anxious brother is left alone with his sister, who declares she’ll stay for three days and promises to keep him occupied with a countdown to sex. She teases him with a plan to hug him from behind, then escalates to intimate contact, showcasing her large breasts and curvy figure while he struggles with his conflicted feelings. The story unfolds with explicit scenes of incestuous passion, ahegao expressions, and relentless desire, culminating in a heated encounter that blurs family boundaries.