He felt guilty, oh so guilty. He was riddled with it but he should've known this was going to happen; they should've known it was going to happen. His animagus form was a rat, surely that was a sign of his nature and personality. They should've known from fifth year that he was going to be a problem in the future.
But they hadn't known. And that was what made him feel guilty.
They trusted him; trusted him with way too much information and therefore it would be their own fault for their downfall when he betrayed their trust to a man, a Lord, who he'd been in service with for the past three years.
They should've known!
All throughout their time at Hogwarts he was the one who would hide behind them, allow them to take the blame for things that he'd done but never returning the favour. It was the Marauder code to do so but he'd never been pulled up on his failure to comply. Any detention he'd got was ones that he'd been caught red-handed for, none that he chose to have.
Even after school, his constant disappearances to "have dinner with Mum" were too often to be believable and yet they did believe him and so almost every other day, he'd scamper off to his Lord and Saviour, feed him all the information he'd gathered in the small amount of time and sign people's death warrants with every word.
So, as he stood at his friend's doorstep, he was riddled with guilt that was eating away at his insides but he felt safe, knowing that his Lord would reward him with great and wonderful things for his service.
But still, he couldn't help but think that if only his friends hadn't been so blinded in their trust, then they'd be safe.
Chocolate Frog Card: Peter Pettigrew (Gold) - Write about Peter Pettigrew.