http://www.gfycat.com/DeadlyWideIndigobunting
more wear porn pictures in category tight_shorts
more wear porn pictures in video channel tight_shorts X tube
from #thread (https://reddit.com/r/tight_shorts/comments/2nuggj/melisa_mendiny_biking_around_in_short_shorts_gif/) by @resaysay
Gif (or more correctly, gfy) via /r/LoveToWatchYouLeave.
It's from [the teaser video clip](http://vimeo.com/47359566) accompanying the photo series "Ride that Pony" by Simon Bolz.