"Well! . . . . Hello there, m'lady." Man what I would give to open the door to HER when I get home. I love her mane and tail and the little hearts. You've also rendered her eyes incredibly well. Then there's her . . . well her body. It seems supple and soft, just how it ought to be.
D'AWWWWWW! But no Fluttershy, I can't be your Valentine, for one I already have a female of whom I love, and two, nopony is nearly good enough for you! You were meant to be like a beautiful, delicate flower growing in the wild. Never meant to be harmed or uprooted, even by a master gardener.
Fluttershy has an strange way of being sexy. Somehow when she is not acting shy she is sexy and femenine. Just take a look at Flutterbitch! [link] If she wasn't cruel and desaturated she would be the most femenine character in the show. Even more than Rarity.
I kind of have the opposite opinion. Fluttershy being Discorded and cruel was breaking my heart from start to finish. (Cementing my murderous hatred for the god of chaos!) When Fluttershy is her usually sweet, soft-spoken, and polite self however . . . God she sends me for a loop! Yeah I'm weird, sweet = sexy to me!