I accidentally discovered my sister Amu masturbating. Teasing me about still being a virgin, she provocatively shows off her body. Unable to resist her behavior, I start masturbating with a dildo to support her. While I can't reach orgasm easily, Amu keeps cumming repeatedly. After satisfying her with fingering, she changes her attitude and starts acting sweet and clingy. Before I know it, her big breasts, freshly grown pubic hair, and my unrelenting erection take over. Days of having my semen drained through her mouth, breasts, and vagina begin.