My girlfriend has twin sisters who are plain, serious, and clueless about sex! I mistook the serious sister for my girlfriend (the older sister) and immediately went in raw from behind! She didn't notice and kept cumming hard with my raw dick. Halfway through, I realized she wasn't my girlfriend but her sister and desperately apologized!! It was risky, but the aroused plain twin sister started grinding her hips and came over and over again! My girlfriend (the older sister) would never let me have raw sex like this, but now she's turned into a woman more perverted than her sister!
