The first time my girlfriend brought me to her room, I was strongly impressed by Momo - my girlfriend's seductive best friend who looked very attractive, especially when she leaned close and asked me to kiss her. In that moment, I realized I had fallen for her! That night, after we finished drinking, my girlfriend fell asleep on the sofa, which was the perfect time for Momo and me to make promises to each other. She asked me to prove that my feelings for her were completely sincere by not having sexual relations with my girlfriend and also not masturbating for the next month. The main purpose was that Momo wanted me to be able to make love to her multiple times after the one-month separation, which was a three-day absence of my girlfriend.