Remus wondered about the jealous part, why would Sirius be jealous of Severus? Most people wanted either to be Sirius or be with Sirius. He would have mentioned the jealous part if Sirius had not decided to first put his hand on Remus' knee and then go onto his knees to beg for forgiveness.
"Siri... please." Remus hoped his voice didn't show how the picture that Sirius made effected his body and mind. "I'll forgive you but I am not the only one you have to apologize too." He might have almost become a killer but Severus almost got killed.
"You don't have to be on your knees though." The wolf inside the soft-spoken boy liked Sirius on his knees but only for him, never ever for Severus. "You have to apologize to Severus too, but not on your knees." He bit his bottom lip nervously. "Could you get off your knees... please..."