[Rico] Monopolizing Onii-chan (Otona Mitai ni Suki ni Shite ne) {Mistvern}

Ayaka already knows what she wants—and she wants her big brother all to herself. After coaxing him into taking her virginity right there on the floor, the sweet little sister turns out to be far bolder than her innocent looks suggest, begging for more even as he loses himself inside her tight, untouched warmth. But when her friends come knocking and start fawning over how handsome her onii-chan is, Ayaka's possessive side flares hot enough to make her declaration crystal clear: he officially belongs to her.