Moto In-Cha no Kyonyuu Yariman Imouto ga Ero Sugite, Onii-chan wa Mou...!!

The protagonist has a younger sister, two years his junior, who was always the quiet, bookish type. For most of their lives, he barely paid her any attention. However, everything shifted dramatically the day she received her first cell phone. Almost overnight, she transformed into an entirely different person—experimenting with makeup, dyeing her hair, and adopting a bold, flashy wardrobe that made her unexpectedly attractive. Alongside this striking physical change, she began using various dating apps and casually mingling with men, blossoming into a confident young woman. Lately, her older brother has found himself increasingly captivated by her sudden evolution. His fascination reaches a breaking point one afternoon when he walks into the living room to find her fast asleep on the couch, her curvaceous figure completely defenseless. Unable to resist, he takes advantage of the moment, indulging in her body while she slumbers. But the encounter doesn't end there. Later that night, he awakens to find his sister straddling him, declaring that she is taking her revenge for what he did earlier. A live-action adult video adaptation (MUDR-252) was released on March 15, 2024.