My little sister can only say "Onii-chan," but with just that one word, her emotions—joy, anger, sadness, love—are all conveyed, allowing me to feel every movement of her heart. She uses her cute mouth to give me blowjobs and make me cum, changes into the school swimsuit she knows I love to seduce me, and even washes my cock in the bathroom, constantly expressing her love through physical affection. Her shy yet affectionate behavior makes me feel as though, deep down, she truly trusts me, warming my heart. Our secret intimacy lasts throughout the night, and seeing her surrender completely to pleasure, responding perfectly to my words, always fills my heart. This relationship with my sister goes beyond mere romance—it's a special, unbreakable bond.