Just got my first girlfriend! My longtime friend, Kokona, who's also my childhood sweetheart, found out we were together and questioned me. I confessed honestly, and while she seemed to bless the relationship, her expression was oddly clouded. Things haven't been progressing to kissing with my girlfriend, leaving me frustrated. Eventually, I confided in Kokona, who I've always been able to talk to about anything. She surprisingly suggested, "Let's practice kissing." I was stunned, but despite my hesitation, we ended up kissing. The moment her soft, plump lips touched mine, my rationality vanished, and the world transformed. Her long, supple tongue danced around mine, entwined with saliva that felt like it was pulling me in, leading to a state of blissful oblivion. Instinctively, we crossed the line into sexual intercourse. My teenage libido was raging, and I found myself prioritizing physical pleasure with Kokona over my girlfriend, culminating in a guilty yet ecstatic climax. With each deepening kiss, my mind became completely absorbed in Kokona. Note: This translation aims to capture the essence of the description while maintaining a neutral tone. Some nuances and cultural references might be lost in translation.