While washing my body in the bath, I sensed someone's presence. There stood my naked sister, Yui. "Can I join you?" she asked. How long had it been since I last saw Yui naked? Maybe because I hadn't seen her in so long, I suddenly felt my heart racing. Before I could react, she slipped right in. As she washed her body, she asked, "Bro, do you have someone you like?" I didn't expect such a question and instinctively ignored it. But Yui continued, "I do..." saying something I wasn't prepared to hear. Her words left me momentarily stunned. Suddenly, Yui gave me a serious look I'd never seen before—and kissed me. Wait, could she mean... me? Before I knew it, I was holding her hand. Slowly, we moved together into the bathtub. She expertly sucked on my nipples, driving me wild, then overwhelmed me with deep kisses and a handjob, making me moan uncontrollably. As I gasped, she whispered, "Everyone will hear you," yet kept teasing her wet pussy with her fingers—not with water, but with her own juices. Then, mounting me in a sitting position, she took me inside her and began moving her hips instinctively. Moaning loudly as she climaxed, she welcomed my creampie deep into her innocent womb. Afterward, returning to the living room felt incredibly awkward. Our secret, intimate moment—locked away in the private world of the bathroom.