When I went to stay at her house, I found out that she was a Rina girl and always slept with her sister, so for some reason we ended up sleeping together in a row... Then I saw her sister's surprisingly huge breasts right in front of me! I love my girlfriend, but I can't resist being seduced by such an older sister! And unlike my girlfriend who only lets me have sex with her using a condom, her sister is 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!