HUNTB-335 『 수영하고 싶다! 』 スク水姿의 여동생과 가랑이 하고 있으면… 수영 수업이 싫은 여동생에게 수영을 가르치게 된 나. 성장 중인 가슴의 팽창에 견디지 않고 발기해…

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I decided to teach my younger sister how to swim because she hates swimming lessons. I cant stand the swelling of my growing breasts and get an erection and cant teach them well! Then, my sister noticed that I was panicking because of my erection, and she said, ``Please tell me quickly, how can I get rid of it (erect penis)? My younger sister cant resist and asks me to fuck her, but she recoils, saying, Of course... I was despairing that this was the end of our brother-sister relationship, but my younger sister, seeing how disappointed I was, suggested, ``Well, if we just rub it together...