My girlfriend, me, and her friend Satori are the ones I hang out with often. Satori is an unusual girl; she'll suddenly show up at my house and then just sleep anywhere, and it's hard to tell what she's thinking. One weekend, she went on a family trip, so we didn't see each other for three days. On the day she left, Satori and I ended up having an affair without either of us inviting her. After that, we had sex many times, as if to make up for the time we missed. We had sex almost everywhere except when we ate and slept. Our time together passed by in an instant, and the day she was due to return was fast approaching.