Disclaimer: I am not, and will never be J.K. She is a much better writer than I am so go read her stuff. Only read mine if you are a) slightly insane or b) in dire need of something to do.
This is a poem that I think Severus might have written when Lily and James got married.
I am Drowning in the Life You Gave Me
I am Drowning in the life you gave me.
You gave me all I have.
Your lovely lips gave me my breath.
Your emerald eyes gave me my soul
Your fire-like hair made me see
That there is a life to live
The love I feel consumes me
The meaning of life is gone
I felt your arms around me.
And now without you I fall.
You've gone to him
I'll never breath again.
You gave me life
But you've killed me too
I'm drowning in the life you gave me
The life that cannot be.