After entering university, I hadn't returned home for quite some time. When I finally came back, my sister welcomed me with her usual warm smile, and I felt truly healed just seeing her. She teared up and hugged me tightly, saying, "I've been so lonely without you, big brother!"—acting sweet and affectionate just like when we were kids. As I felt her warmth, my chest accidentally brushed against her, making my heart race. Later, while soaking in the bath to relieve my fatigue, my sister suddenly entered, pulling my towel away. "Let's take a bath together again, like we used to," she said, instantly capturing my gaze. Her big tits and luscious body, which I hadn't seen in ten years, shocked me like a dream come true. Forced into the tub with her, I couldn't hold back any longer—her presence overwhelmed me. As she moved closer, my cock naturally grew harder. Noticing it, she smiled playfully and started touching me. "I'm an adult now, big brother... Since you're this excited, should I let you cum inside me?" Unable to resist my primal instincts, I crossed the forbidden line. Her words shattered my reason, and I mindlessly thrust my cock in and out of her pussy. Overcome by pleasure, I creampie her again and again. A secret I could never tell my parents—the forbidden encounter with my sister in the bathroom.