[Leonardo 16sei] Don't Call Me a Plain Jane (COMIC LO 2022-09) {Mistvern}

Shy, bespectacled Yuri heads to the mall with her classmates to plan a group outing, never suspecting her big brother is lurking nearby with something other than shopping in mind. He pulls her into a public restroom, teasing how soaked she's gotten before burying himself deep inside her from behind while she bites back every desperate moan, terrified a single peep will give away their forbidden little secret. Even when footsteps pass just outside the stall, he doesn't stop, pounding her until she's a trembling, dripping mess—and afterward he strolls out to treat Yuri's friends to food, leaving the girl to quietly decide she's earned a reward of her own.