Riri Nanatsumori, her younger sister, is cuter and more innocent than she is. There's something about her that has caught my attention...her revealing summer outfit that shows off her toned legs and flat stomach. But what really gets me going are the accidental panty shots when she relaxes at home; not to mention the occasional nipple slips through her thin fabric bra! It's impossible for me to resist those lucky peeks at her perky tits. Despite knowing better, I can't help but be drawn in by her vulnerable seduction. Before I know it, my hands are all over her chest, grinding against her hardened nipples while my hips thrust wildly. She's right there beside me...and the forbidden thrill sends us both spiraling into an intense frenzy of passionate lovemaking. Our insatiable desires consume us until we explode in a series of powerful orgasms that leave us spent and satisfied...at least for now.

彼女よりも可愛く天真爛漫で超ドタイプの妹・りりちゃん。ただ出会ってから気になることがある…それはイマドキの女子の肌露出の多い夏着ファッション。さらに家でくつろいでいるとスカートからマン筋がくっきりパンチラ。しかもノーブラで屈むとパイチラ、乳首まで見えるラッキースケベについつい目がいってしまう。ダメだとわかっているのに無防備誘惑に理性ぶっ飛び、気づけば胸を揉みしだき暴走ピストン。彼女が近くにいるのに…背徳快感に呑まれ熱中症になるまでオーバーヒート激突きにイキ散らす。互いに性欲が止まらなくなり貪り狂った人ひと夏の思い出…。