Severus.

Do not fear, Severus, for I am not a ghost.
I am very much indeed well and alive...
You are also, my faithful servant,
Given another chance to survive.

Betrayal is bitter taste to us both,
Shared in moments of seclusive Death.
There is, perhaps, a reason you hear my faint voice...
My soul is still here, but absent of flesh.

The mark on your arm, will grant you my presence,
It is forever permanent, etched by The Dark Lord.
You were once ugly filth, but now I have cleaned you...
To witness him rise again, with a powerful horde.

First I need the vessel, but not just any wizard's...
The one I require, is not easy to deploy.
Pick up your body, brother, do as I say...
Travel back to Hogwarts, and bring me the boy.