I was about 22 and knew this Russian girl aged 29 from work. I thought she looked super hot the very first time I saw her. Unfortunately she ended up being the girlfriend of another colleague I worked closely with and also had drinks with occasionally. Soon we went out in three and she always teased me a little bit by rubbing onto me, or just through her looks and smiles. I knew it and I saw it coming... Then my colleague had to go abroad and knowbody really knew what his plans where about coming back. So his girlfriend stayed in touch and one evening I was totally worked up about a horrible day at the job, she invited me over to her place to talk and have some wine... Oh boy. It did not take much and she was all over me. Older, more experienced and so sexy I could not do anything against it, really! This continued for some intense weeks or months, until she too was about to move abroad. We decided to meet to say goodbye, with a dinner and nothing else, really. But as always the tension between us was incredible and on the way from the restaurant to the tube station she pulled me into a dark side alley. I could hear the people passing by and the side alley was basically a little path leading up to a multi story building with a good chance someone wanted to get in or out of it at that time. She did not seem to care and pulled down her panties. She then leant on a wall and dragged me close to her. She was facing the wall and still managed to pull out my dick behind her and direct it into her. Half way between being scared and horny I started doing her and it did not take long until I came. She used a napkin from her little purse, wiped us clean and gave me a kiss on my cheek. We went on to say goodbye and I did not see her for at least six years after that. I am still thinking of her as my hottest sex encounter.