First of all you can't make it happen if she's not into it.You say she's shy,may i suggest a porn with a ffm theme and the adult beverage of your choice and kick back and enjoyWho knows maybe it will get her to open up to the idea,just don't push it.
It can be a beautiful thing:P

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CAPTIVATE MY ATTENTION, POSSESS MY BODY, INVADE MY MIND, ROCK MY WORLD AND, CALL ME "YOUR" BITCH... YOU KNOW MY HUNGER, YOU OWN MY DESIRE, YOU HAVE MY WILL, TAKE ME BABY... DIVINE PLEASURE