Image search has produced a 13 minute video streaming at several sites as "Danish Girl Michelle Andersen" that includes the scene from the mystery gif.
videos/danish-girl-michelle-andersen-5624744
More of her material here;
https://www.porndex.com/view.php?q=michelle+andersen
Code:
http://bbwgirls.plumpersandbw.com/080612-3/michelle.php?nats=askass.75.27.27.0.6002451.0.0.0