I had a girlfriend for the first time, but my childhood friend Rin couldn't help but notice that I couldn't even kiss her properly, so she suggested, ``Why don't you try practicing with me?'' We practice everything from French kisses to deep kisses, and the feel of Rin's soft lips and tongue intertwining with each other feels more pleasant than we imagined, and we are absorbed in kissing practice day in and day out. I couldn't resist the pleasure of the rich deep tongue of Rin with just a kiss, so I half-forcedly offered to practice sex and had sex with Rin. Since then, things have been awkward between us, but we can't forget the feeling of kissing each other...