It was about you saying it happened in the first place. It was so simple but such a fucking revelation at the same time that Sirius felt like he'd been hit with a fire poker.
"My mother hurt me." He whispered, again, trying his best to take what Peter was saying to heart. "My... My mother, starved me. And tortured me, for years. She tried to kill me. My father asked her to."
For a second he thought me might never be able to breathe again. But then he was testing in a ragged gasp and moving from his chair to Peters without really thinking about it. He held his friend close, and he didn't cry, but it kind of felt like he was with the way he was breathing.