The imagery is wonderful. It flows well and the ending is perfect; I like it alot. It feels like poetic prose to me. In that light ...
Points: Very lyrical, but the unnecessary repetition of some words (a good poetic device, but not here with the overuse of 'sand') detracts. I'd say print out a copy and circle every word that is used twice or more and decide whether eliminating or changing one would help.
I'm also not particularly fond of some of the adjectives and adverbs. Could be tighter.
"refers to yet another innocent butterfly. I don’t feel them taking off, and I’ve done nothing to attract the beautiful creatures" By this time we know all about the butterflies and you've already used 'beautiful' and ... 'yet another' does not help.
Why not something like ... "rests/lands on/licks another spot/freckle/pore/flake of innocence"
or ... "to attract this/their beauty/elegance".
Also since you've established the butterfly motif and metaphor quite well, at some time you can introduce 'a part as whole'. You do this with wings, but why not the long tongue, the irridescent eyes, the smooth slender body, the very light feet ... all six of them .
Only one grammatical note (not my strong point):
My skin in (is) sensitive
As for the lesbian/gay genre. Although you know you're a woman, the reader (out of context) does not. There is no reference to your female nature. You could just as easily be a man having a dream of butterflies and waking up to his female lover (you do refer to her as she). This is good or not-so-good, depending on your intent. In a book of lesbian lit, it would be a mute point, but standing on its own it is ambiguous.
So ... overall, a worthy piece of writing.
Thank-you ever-so-much, Kåre.