My girlfriend always insists on using condoms and has never allowed bareback sex, no matter how serious our relationship gets. Her stance never changes. But her older sister is completely different—she flaunts her big tits and sexy body, openly tempting me with creampie sex. I love my girlfriend, but I can't resist such a horny, aggressive woman. The thrill and guilt mix into an overwhelming excitement. I got carried away and fucked her repeatedly, until my girlfriend found out. Still, the pleasure was too intense to stop, and in the end, I came deep inside her sister.