The notion had been coming up a lot lately. Seeing something like that happen and knowing how Remus would be in such a situation all made him feel terribly guilty. As if it had happened on purpose. It was stupid, but he didn't like any of it. Especially not when he thought it really could happen.
Sirius stayed there, his fingers responding to Remus' by curling against his stomach. "Sorry," he managed to mumble after some time, once his face was pressed into the side of Remus' neck and he thought things were somewhat calmer.