Remus / Sirius
Sirius neglecting to mention the fourth member of their pack by name was most definitely intentional, and Remus didn't miss it. He also didn't draw attention to it. The things that particular person had done were entirely unforgivable. Remus didn't condone violence, but if he ever came face to face with him he wasn't sure he'd be able to stop himself from taking revenge, and he knew full well Sirius would go at him, wand drawn and ready to avenge their fallen friends and Sirius' own reputation. Rather than dwell upon that, though, he much preferred to indulge in the way Sirius was nosing at his jaw for attention.
For the record, it wouldn't have stopped Remus either. While he might've made an initial fuss about the others being in the room, he wouldn't have stopped or tried to stop Sirius. But things had been as they were and they were still beautiful and perfect and even when they weren't so perfect and things felt hopeless it hadn't lessened how Remus felt about him even a little.
"Oh, I'm counting on you to remember," he said, a little mischief in his eye. "And for you to remind me constantly throughout. And perhaps again at home, later." Remus reached a hand up to trace a little bit of Sirius' hair away from his eyes. "Think you can manage to keep me focused on that and not the film?"