My little sister grew up to be incredibly cute, but she was super serious and seemed completely uninterested in anything lewd. I thought she was this pure girl, but it turns out she's incredibly perverted! At home, my little sister caught me with an erection, and I thought she'd hate me for it, but instead, she got excited... even straddling me and vigorously grinding her hips! Her usual seriousness couldn't have prepared me for how slutty she was—drooling and begging for my dick, riding me in a super erotic way, demanding non-stop orgasms with high-speed grinding in a cowgirl position, forcing me to finish inside her!
