When I went to my girlfriend's house to play and had sex, her sister saw us doing it! Apparently my dick was similar to her ex-boyfriend's, so she targeted me! I love my girlfriend, but I can't resist being seduced by a woman like this! And unlike my girlfriend, who only lets me have sex with a condom, my sister is okay with having sex without a condom! And she's okay with cumming inside me! Even though my girlfriend is right next to me, the raw sensation feels so good that I can't stop thrusting!