Even though he had been teasing, Remus hadn't expected James to protest. All this talk about the four of them almost made Remus ask James if he'd heard from Sirius lately, but the description of The Map distracted him, "Now that certainly does sound intriguing. I'm now looking forward to dreaming about this Map. I assume, we used it to sneak around?" Because what other reason would there have been to have a magical map like that, if you weren't going to use it to sneak around?