I went to her house after work as usual, but she wasn't there and I couldn't get through to her on the phone, so I went to sleep and waited... The next morning, when I woke up, it wasn't my girlfriend next to me, but her older sister! Her older sister, Alice, has a completely different appearance from her, with flashy nails and makeup, and is a blonde with big breasts and fair skin... Alice. Maybe she's still drunk, because she pressed her voluptuous breasts against me! I was at my wit's end from the erotic prank that started in the morning, and my older sister was up to something. She asked me all about sex with her, and we took an erotic turn, and I was completely at her pace. Finally, I was molested by her older sister...!? A story of Alice Otsu's slut techniques and continuous climaxes with massive squirting.