I have to say that there isn't just one position in my fantasies. I mean fantasies is where you let everything go so why pick one, right? I'd say there would be a series of positions I'd find myself in to please my man/boyfriend/lover/admirer. It would start with something like this to get hings warmed up and for me to get a taste of things to come.
Then it would follow with me spreading my legs and letting him in my pussy. I know it is a traditional position but I think that is what entices me about it. That every girl has found herself in this position sometime in her life more often than not. It would be deliciously feminine to spread my legs and welcome him in me.
Lastly, if he was still up for it, I'd let him treat me and fuck me like the bitch that I am. ;-) What else could be more delicious than feeling him bouncing on my ass and let him do as he pleased?