It comes from this site, and it looks to me if you hover over the image and see the series of screenshots, the last greyed out one looks like he's about to jerk off onto her tits.
Look for the video with her and a guy on a black couch with multi colored pillows
http://www.explicite-art.com/model_portrait.php?model=lizadelsierra
Yes, it’s a TF finish :
http://videos.rebootcash.com/explicite/fr/cc=l03774/tp=24/lizadelsierratitofvids/video7.wmv