I had just gotten my first girlfriend, but I was too shy to even kiss properly, so my childhood friend Rin suggested, "Do you want to practice with me?" We practiced from French kissing to deep kissing, and the feeling of Rin's soft lips and intertwined tongue felt better than I'd imagined, so we had a great kissing chemistry and we got absorbed in practicing kissing day after day. I couldn't resist the pleasure of a deep, drooling French kiss, so I half-forcefully asked her to practice sex with me, and we ended up having sex. Since then, things have been awkward between us, but we haven't been able to forget the feeling of our kiss...