The wedding was a ton of fun. We were all drinking and dancing and having a great time.  I spent a lot of time dancing with my wife's little sister.  I could tell by the way she moved that she would be an amazing fuck. She was tipsy enough to follow me upstairs.  This venue was huge so finding an out of the way room was easy.  I took her in to one of the upstairs bathrooms. 

 She asked me what I was doing and I leaned forward and kissed her and held her there.  Things got hot quickly.  Before I knew it, she squatted in front of me and took my cock out.  She looked up at me and said "we can't have sex, but I can do this for you'  She proceeded to give me the most amazing blowjob of my life.  Her mouth was soft, warm, and wet. She sucked and stroked me perfectly. Her mouth and throat were like a cunt with my cock burried deep in it.  I came intensly as she fucked my cock with her face. When I was done, she stood up and said "let's hurry up and get back to the party before anyone comes looking for us.