My girlfriend has small breasts and is passive in bed, insisting on condoms every time. But her older sister is the complete opposite—she's a big-titted, horny aggressive girl who's totally okay with bareback and creampie sex. I can't resist her seduction. Though I feel guilty, I can't hold back—I end up ignoring my girlfriend and enthusiastically fucking her sister instead. The thrill of almost getting caught by the younger sister only turns me on even more, keeping me rock hard. Eventually, we do get caught, but the sex feels so damn good I can't stop, and I end up creampie-fucking her sister right in front of my girlfriend.