they dedicate their lives
to running all of his
he tries to please them all
this bitter man he is
throughout his life the same
he's battled constantly
this fight he cannot win
a tired man they see no longer cares
the old man then prepares
to die regretfully
that old man here is me
Severus Snape has always been known as "the bat of the dungeons."
He knew this, since he worked hard for that persona; Worked hard to stay alive. He had plenty of hardships throughout his life. He knew that the tasks he was asked to perform were indeed unforgivable. He thought that he was safe finally, safe from his irresponsible decision he made. Even though Lily was dead, his Lily, and it was her son that vanished the Dark Lord. Then he came back, and he knew that Dumbledore will ask him to go back. He needed a spy, and who else could be that spy other than him? He hated himself, so it was easy to make that brat Potter to hate him. He hated to look at his ugly self in the mirror.
Damn Voldemort! Why did he make him suffer so? Couldn't he just die and give him peace? But of course then he wouldn't be a despot. Of course he had to suffer, after all the unforgivable tasks he had to perform, he knew he was destined to suffer for all eternity.
Then finally the final battle was approaching, he knew he had to die. He worked so hard to stay alive, but to what cause anymore? Then that awful night, he knew he would definitely be the Unforgiven.