Returning to my hometown after a long absence, I saw my incredibly cute younger sister, Momojiri Kanon… and our parents weren't home. Seeing that she was ignoring me while I took a nap, her underwear showing, just a towel wrapped around her waist… and then she came over while I was masturbating in my room, gently stroking my super hard penis until I was about to ejaculate! Can I really hold back until the end without being tempted?