One day during summer vacation, my cousin suddenly came to stay over at my house, and we decided to have a "Cum if you lose" contest over pudding. When I accidentally got excited, my spiteful cousin started teasing me. This made my cousin very upset, so he tried to make me cum with a blow job, and he ejaculated into my mouth. That night, my cousin came into my room and we masturbated together. And the next day, we had creampie sex and came over and over again until my mom got home from work!