Turn the Sandstone Drake into a Female Vrykul

You have to have two things. 

1.) A Sandstone Drake
2.) You have to be far enough in the Storm Peaks Hyldesmeet quest chain to where you turn into one of the Vrykul entering the said area. 

You can land, take off, etc. as long as you don't dismount. 

From there just mount your sandstone drake before entering the area and when you do enter the area, you'll be a floating vrykul like so: