“Peter, did he recognise you?” they asked, returning back to the common room and untying the cloak.
“N-no, I don’t th-think so,” he stuttered.
They had been worried. Surely Snape knew the rat was Peter?

“Oh well, he can’t say anything anyway, he’d have to admit to being out of bed this late just like we were. And he can’t prove it, anyway. What are they going to do, make us morph?” Sirius asked.
Remus and Peter both looked frightened.
James reassured them, “He was in the wrong, not us. Look how scared he was! He won’t be telling anyone.”