Write from the snake's perspective after Harry sets him free at the zoo
The snake slithered out of the Zoo as people screamed. He didn't know where he was going but he was finally free. He made it out of the Zoo and the busy streets of the city to a forest where he would be able to stay and hunt. He stayed there for a long time, hunting and just moving around. He loved it. After three years, he grew tired of that forest and decided to move. While he moved he met a strange human who could talk to him like the little boy that had set him free. It was strange the similarities that he saw in the two humans.
The snake didn't know what happened but the human gave him a name, Nagini, and somehow they became connected. From there on Nagini stayed with the human name Voldemort. One day though, he learned who Voldemort was trying to kill. A boy named Harry Potter who looked oddly familiar. He looked like the little boy from the Zoo that he was captured in who had set him free. Nagini didn't dwell on that thought too much though, for he and Voldemort had to kill the boy and Nagini wouldn't feel remorse if this boy was who he thought it was. Nagini would just do what he did before he found out who his master was trying to kill.