hey i answered your question before, i am posting the link, but before i do i just want to say that it's your fiance's choice whether she wants to have sex with you in that particular position and if she for some reason finds it unenjoyable you shoud understand and not pressure her but rather wish for her to enjoy as much as you do and maybe find another position which you both enjoy, anyway here is the link:
http://yedda.com/questions/sexual_intercourse_1869124335219/