I, Tatsuya, and Momo have been best friends since childhood. I have secretly loved Momo since then but have never dared to confess. Time passed, and because of work, I hadn't seen Tatsuya for five years. This time, on vacation, I decided to visit my best friend's place for a few days. Tatsuya's apartment is quite spacious, not really suitable for someone living alone. And it was true, he had a girlfriend, and that girlfriend was Momo! The person I once loved is now my best friend's girlfriend. It's an ironic truth, but I can only wish happiness for the two of them. Tatsuya often drinks due to work pressure. When he went to the restroom, Momo approached me and wanted to kiss me! Momo hates the smell of alcohol the most and resolutely refuses to kiss Tatsuya. On the contrary, I don't drink at all, and according to her, my lips are soft, and kissing feels incredibly pleasant. Unable to resist Momo's cuteness, my feelings of guilt towards Tatsuya vanished. For three days, whenever Tatsuya was absent, Momo and I were glued to each other, our saliva mingling as our mouths barely separated...