[Tamai Shikine] Untouchable (Bishoujo Kakumei KIWAME Road Vol.11)

An ordinary brother finds his unassuming life derailed when his super-popular older sister, freshly heartbroken over her boyfriend, decides he must pay for her frustrations and become her personal outlet. The tension erupts across multiple settings—her demanding him to relieve her in a hallway, pinning him down at his desk, and unleashing her full, bouncing curves on top of him as he helplessly submits to her rough, teasing rhythm. As the pages progress, her brazen dominance only grows more inventive and shameless, culminating in her gleeful declaration that she can enjoy her steamy little brother every night—leaving him flustered, completely at her mercy, and aching for more.