Lithium

You declared that I was purple,
The complexion of ecstasy.
An aphrodisiac--
The allure of slurping mollusks,
And the titillating anxiety
Of a calloused hand  
Enclosing around my trachea.

Contrarily, I was metallic--
The taste of biting your tongue,
A sweltering, stifling box
Of alloy, threatening  
To smother you alive
Upon failure of evasion.
Or silvery, soft, and palatable,
Able to rectify distemper
In the hearts of the melancholic.