[China] Imouto wa Doujin Shoujo Cosplay Kei Ch.1-8 [biribiri]

A doting older brother becomes his little sister's doujin circle's most prized acquisition when the club votes him official equipment—'Everyone's Onii-chan,' to be shared by every member hungry for a turn. His possessive twintailed sister isn't about to hand him over without a fight, especially once she uncovers the staggering erotica archive he's been hoarding, complete with cosplay costumes, figurines, and adult toys shelved like a library. What follows is a chaotic sibling tug-of-war of secret clubroom trysts, maid outfits, bunny suits, and energy drinks blurring the line between family devotion and something far more exhausting.