I spent the night at my girlfriend's place for the first time. I'd heard her older sister lived with her, but was away today. Seizing the opportunity, I arrived to find a naked gyaru waiting for me. It was my girlfriend's sister, staring at me with lustful eyes. Craving attention after breaking up with her boyfriend, she whispered, "It's fine if I just suck you, right?" Taking advantage of my girlfriend's absence, she gave me repeated blowjobs. The pleasure was intensely overwhelming, and my relationship with her sister quickly deepened.