So recently I was at my girlfriends house and her parents were away so we had a couple friends over and her older sister had some of her friends over and we were drinking. It was pretty late when my girlfriend said she wasnt feeling good and she was gonna go upstairs to sleep. Now everyone was leaving and the last person left and it was just me and her sister. I told her I was about to leave as well and she asked if I could help her with something. I walked over and she grabbed me and started making out with me. I grabbed her big butt and she went straight for my package. She took it out, got on her knees and started giving me head while i sat on the arm of the couch. She is 3 years older than me and looks like my girlfriend but with bigger boobs and ass. She had short shorts on so i threw her down on the couch and ripped them off. We fucked in a couple different positions and she told me it was alright to cum inside her. I did not get soft after i busted because i thought this girl was so hot. She stayed with me inside her for a while with my jizz slowly leaking out. I removed myself from her and I walked home drunk as hell.