When I went to her place, I met her super cute little sister. I couldn't help but be more attracted to her than to her girlfriend. I took a chance and attacked her, and while she seemed hesitant, her resistance was weak. I boldly squeezed her tits, gave her a handjob, and performed a forceful blowjob. I couldn't stop there, so I went all the way and fucked her. Since that day, her sister has become obsessed with my cock, and we've been sneaking around and fucking her without her girlfriend finding out.