This one is in the process of being finished, here's what I have so far (it kinda blows!):

Beautiful Being,
Kind Creature,
I can't shelter you forever,
I could never love you like I should,
my seas of green,
would cloud with black,
if your vital presence were ever to fade,
can you linger without my deepest affection,
the agony in your eyes,
is the destruction I feel inside,
what words can I say,
when all the right ones swam away.