We met as a friend of my sister. We got along well and I was increasingly drawn to her. One day, when we were alone at home, she asked me, "Do you want to have sex with me?" We had sex many times since that day. Even though we both had other partners, sex just the two of us was... completely different. We were able to express to each other our perverted desires and selfish feelings. My first sexual experience and my first creampie were with Aika. And soon, that Aika will be getting married...