My girlfriend and I are not married yet, but we decided to live together for a while.
She works in an office and I am an engineer, so both of us have quite stable incomes. One day, her best friend Rin Natsuki came to my house and wanted to stay for a few days because her house had just been sold and she hadn't found a new place to live yet. My girlfriend had already consulted me about it beforehand, so Rin staying here was quite normal for me.
However, her beauty caught my attention. That night, when I went to the bathroom, I saw Rin taking a shower; I secretly watched and smelled Rin's panties. The next day, my girlfriend went on a business trip, and at that moment, Rin wanted to talk. She had seen what happened yesterday, and I felt scared and embarrassed. It was surprising when Rin turned to flirt with me; how could I possibly refuse?
