I was invited to a sleepover date with my girlfriend and went to her place, where I met her incredibly cute, big-breasted older sister who lives with her. To my surprise, the sister suddenly started making aggressive sexual advances. Even though my girlfriend was right there, I instantly gave in to her sister's seduction. While my girlfriend insists on using condoms, her sister is okay with bareback and creampie—making her an irresistible exception. Unable to resist her charm, I got caught up in passionate sex with her.