"The Witch With Eyes of Amber" by Clark Ashton Smith

I met a witch with amber eyes
Who slowly sang a scarlet rune,
Shifting to an icy laughter
Like the laughter of the moon.

Red as a wanton's was her mouth,
And fair the breast she bade me take
With a word that clove and clung
Burning like a furnace-flake.

But from her bright and lifted bosom,
When I touched it with my hand,
Came the many-needled coldness
Of a glacier-taken land.

And, lo! the witch with eyes of amber
Vanished like a blown-out flame
Leaving but the lichen-eaten
Stone that bore a blotted name.

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wanton, in this context, is going to mean a sexually unrestrained woman

To follow along: https://en.wikisource.org/wiki/The_Witch_with_Eyes_of_Amber