On the eve of my marriage proposal, I was lost in a passionate lovemaking session with my childhood friend, who jokingly said, "Tomorrow we'll be doubly illicit..." (Akari Tsumugi JUR-139)

I'm an ordinary office worker, dating my colleague Nao, and planning to propose to her tomorrow. That day, after work, Nao and I were discussing dinner when I received a phone call. It was from my childhood friend Tsumugi, saying she'd lost her wallet and needed help. I told Nao it was my male colleague in trouble, and then went to Tsumugi's place. After taking her to her hotel, as I was about to leave, she grabbed my arm and asked me to stay a little longer…