Dinner together with my girlfriend and her older sister. The moment my girlfriend briefly steps away, her sister suddenly kisses me. Though I truly care for my girlfriend, I can't resist her sister's seduction. She pulls down my pants and immediately presses her body against mine. While my girlfriend only allows condom sex, her sister permits bareback and creampie, and I can't withstand the intense pleasure. Even with my girlfriend nearby, the sensation of bare skin feels too good, and I can't stop thrusting.