My friend's "cousin Imouto," basically the biggest loser ever, messed up on some job and left me to clean up the mess. When I heard about it, she muttered, "Big bro really had a tough time this time..." This "Imouto" girl then bravely said, "I'll do anything I can to help!" Before I knew it, we ended up doing gonzo sex. She didn't say a word while being filmed, and since I thought she had a pure, innocent image, I figured her sex would be boring. But surprisingly, she was actually pretty horny. Under her innocent-looking dress was a stunning E-cup, a slim waist, and a full, shapely ass that drove me wild. As soon as we got to the hotel, she immediately gave me a handjob and whispered, "It smells..."—I couldn't hold back anymore. Giving in to desire, I fucked her relentlessly, watching her pure image slowly crumble, which was incredibly hot. Even more, she squirted like crazy—flooding the hotel room with so much juice I almost felt bad. Then she started sucking on my nipples and jerking me off. At that point, I stopped holding back: I made her masturbate with a vibrator first, then slowly inserted myself. I made her climax over and over, completely turned on by the taboo thrill of being with my friend's imouto.