Remus had learned the previous month that his canine body held memories of past transformations that were vague at best to his human mind. It remembered to stop and pause until he got his bearings after the pain subsided. It remembered to sniff the air, checking for the presence of pack before moving, standing slowly. Scenting all of his pack on the air sent a thrill through that part of him that had claimed three lovably reckless boys as pack years ago and mourned the loss of that pack for too long. Giving a little yip of joy, he went closer to nuzzle each one in a sign of acceptance that was, again, something his wolf body knew to do instinctively while his human mind wanted to hug each one of them tightly.
The sound of the other wolf's howl brought his head up, instincts on alert for a brief moment until his human mind could remind that part of him that acted on instinct that Fenrir was there at his invitation.
At the playful challenge, Remus let out an amused huff and looked between his friends as if to say 'well? are we letting him get away like that?' The same built up energy he'd noticed the previous month was making itself known and he spared a tiny thought for whether this was what it had been like without the potion, if this playfulness was what his friends had experienced from him...after he'd ascertained they were neither threat nor food. Butting his head against Padfoot's shoulder, he cast a glance at Prongs and Wormtail, then let his muscles bunch underneath him to propel him forward as he bounded after Fenrir.
Moony was ready to run and he just hoped the other Marauders were willing to keep up with two werewolves.