My girlfriend and her sister run a popular YouTube channel, 'Bikini Sisters.' Today, my girlfriend asked me to help film, my first time meeting her sister Sumire. Instantly, I was drawn to her smoking-hot body in a skimpy bikini. After shooting, my girlfriend and I went to her room and fucked. Sumire spied on us, and when I went downstairs, she seduced me with her big tits, draining my cum. That night, she snuck in, demanding I fuck her while my girlfriend slept beside us! She even let me go raw and cum inside her pussy—something my girlfriend never allowed. We kept sneaking fucks whenever we could, until I was set to study abroad in France with my girlfriend. But it didn’t end easily—Sumire lured me for one last fuck, and my girlfriend caught us...