In the middle of the night, I heard a strange sound. Creeping toward the room of my sister Shoko, someone I rarely talk to, I found her fast asleep with a vibrator inserted deep in her pussy. I'd never seen my sister as a woman before, but her explicit appearance instantly aroused me. I tried gently pulling the vibrator out, yet guilt over touching my own sister clashed with my uncontrollable desire. In the end, I thrust my cock inside her. Unable to resist, I pounded her tight pussy hard—my first time with my sister. Fully aware it was wrong, I couldn't stop the overwhelming urge and erupted in a violent creampie deep inside her.