【親の再婚で出来た妹は巷で噂の都市伝説級ヤリマン！？】義父の連れ子であるmiruは、街で男を捕まえてはSEXに興じるビッチ系ギャル。彼女は超がつくほど生意気で、兄である僕を’ダサい’、’冴えない’、’童貞臭い’と散々バカにしてくる。でも、あろうことか、彼女に弄られるのが少しずつ快感になってきて…。そんなある日、リビングでエロ本片手にシコっていると妹にオナバレ！勃起チ〇ポを目撃されてしまう。ヤバい、また絶対バカにされる…と思いきや、’勃起したら結構いいチンチンしてるじゃん’と意外な反応で！？’チンチン触られるの初めて…？じゃあさ、私がどーてい（童貞）奪ってあげよっか？’とトントン拍子で話が進み、寸止め・乳首カリカリ・カウントダウン射精と、童貞には刺激が強すぎ・衝撃的な初体験！それからというもの、一線を越えた僕たちは、ところかまわずHするようになって…。朝勃ちチンポフェラ、キッチン隠姦、お祭り終わりの浴衣SEX。小悪魔妹に四六時中、されるがままに犯●れます！
[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 catches men on the street and enjoys sex. 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 that she was crazy and would definitely make fun of me again, but she unexpectedly responded, “When it gets erect, it’s a pretty good dick!” ? ‘It’s my first time being touched…? Well then, how should I take your virginity? ’ and the conversation progressed at a rapid pace, with the stoppage, crunchy nipples, and countdown ejaculation, a shocking first experience that was too stimulating for a virgin! Since then, we have crossed the line and started having sex everywhere… Morning erection cock blowjob, kitchen secret r**e, yukata sex at the end of the festival. My little devil sister will do whatever she wants to me all the time!

– JavGG.net