My girlfriend's younger sister's summer outfit accidentally exposed me, and I lost my mind... Nanamori Riri SONE-011

My younger sister, Lily, is cuter than my girlfriend, innocent, and totally my type. Ever since we met, I've had some strange thoughts about her… namely, the way girls wear summer clothes these days, revealing too much skin. And when she relaxes at home, her skirts expose her lower abdomen, and even when she's not wearing a bra, her nipples are exposed, giving me a strangely erotic feeling. Although I know it's wrong, I'm still attracted to her defenseless allure, and without realizing it, I find myself fondling her breasts, thrusting violently until I reach a point of frenzy. Even though she's right next to me, I'm still drawn to the perverse pleasure, immersed in intense thrusting until I'm exhausted. Our sexual desires become increasingly uncontrollable, indulging in greed, and thus, a summer of memories is created.