My first night at my girlfriend's house! I followed her to the shower and opened the door, and there was her sister! As I apologised frantically, she pressed her tits against me, which were bigger than hers...!? I care about 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 her using a condom, she's OK with raw sex! And she's OK with cumming inside her! Even though my girlfriend is right next to me, the raw sensation feels so good that I can't stop thrusting!