[Soukousen (Pizanuko)] My Sacred and Sexual Sister {Doujins.com}

Chika, a pious little sister dressed in a nun's habit, convinces herself that letting her big brother touch her is simply 'the sensible thing' — even as her crotch tattoo, beauty mark, and trembling, sweat-soaked body betray how long she has been waiting for this. Her guilty justification melts away panel by panel until she flips the script entirely, mounting him with a breathless grin and demanding he pump his seed into her 'holy sister' pussy. What begins as hesitant rationalization ends in shameless, heart-eyed devotion — one confession neither sibling wants absolution from.