[My younger sister, who was born through my parents' remarriage, is a rumored urban legend-level slut! ? ] Miru, my father-in-law's stepchild, is a bitch gal who enjoys sex with men on the street.She is incredibly cocky and makes fun of me, her older brother, calling me ``uncool,'' ``boring,'' and ``smelling like a virgin.''But, as expected, I gradually started to feel pleasure being played with by my girlfriend...One day, when I was jerking off in the living room with an erotic book in hand, my girlfriend's sister masturbated!She ends up witnessing his erect penis.I thought she was crazy and would definitely make fun of me again, but she unexpectedly responded, ``When he gets erect, he's got a pretty good cock!''! ? 'This is your first time being touched...?Well then, how should I take your virginity? 'The story progressed in rapid succession, with the stoppage, crunchy nipples, and countdown ejaculation, too stimulating for a virgin, and a shocking first experience!Since then, we've crossed the line and started having sex everywhere...Morning erection cock blowjob, kitchen secret rape, yukata sex at the end of the festival.My little devil sister will do whatever she wants to me all the time!