Unlike woman there is only really one good position to fuck a shemale, From behind. Which is quite good since that indeed is my favorite position! When you get them on all fours or sitting on your cock, for starters they are free to play with themselves while you pound your ass (Its not like I am going to play with them). Second well.. its just a great view!
Unlike other positions one also gets rewarding feedback in the form of their ass jiggling the harder you fuck them. As the shock waves from your pounding roll across their shemale ass it makes tranny sex all that more rewarding
From Shemale Nova 
You are a hot blonde. I wish I was there to suck you both.