Always being bossed around by my older sister, I let her take advantage of me—she never returns my manga, constantly forces me to give her massages, and treats me like her personal servant. Then one day, she playfully used an electric massager on me, and to my embarrassment, I got an erection. Noticing my reaction, my sister began repeatedly milking me dry, extracting my cum over and over again. The story captures the complex emotions I feel, my sister's dominant yet teasing attitude, and the unspoken tension between us. A sweet, hidden intimacy emerges from the ordinary moments of daily life.