On a hook grub, I tie a CDC feather as I do when tie the Mirage.
With the same procedure, I tie another feather on top of the first one.
Although there are now two hackles, I proceed as I did with one hackle when tying The Mirage. I secure the base of the two feathers next to the eye of the hook, after having pulled back the CDC fibers.
Trim off the excesses of the feathers.
Flip forward the second extended body to divide the fibers and obtain two horizontal spent wings.
Trim off the excess of the feathers at the hook eye.
Tie the head of the fly.
Trim the tip of the feather, leaving two fibers on the sides to imitate the tails.
Remove the fly off the vise, and holding the fibers I trim the excess to give the right dimension to the wings.