[Akubinium] She Came From Overseas! (COMIC LO 2023-03) {Mistvern}

A bratty half-American step-cousin sweeps back into her onii-chan's life after years overseas, all swagger and freckles, demanding he play with her like old times. Her relentless teasing backfires spectacularly when he decides her 'sexual awakening' is overdue, flipping the cocky little tease into a squirming, overwhelmed mess as she loses her virginity—and her dominance—beneath him. Even dazed and filled up, she keeps that bratty mouth running, demanding he pay for the sex while he cuddles his thoroughly tamed cousin close and muses that one night of punishment won't nearly be enough.