Remus looked from Severus to the door that just appeared. "Bloody hell, Severus. This is exactly what I was just thinking. When I came back from St. Mungo's Dumbledore told me this odd story about needing the loo and one suddenly appeared and there was all this toilet paper." Remus said with a laugh as he hurried over to the room and threw open the door.

And then it made sense. This was the spot on the map that continuously fluctuated. Sometimes it was there, sometimes it wasn't. Sometimes it was big, sometimes it was a little room. This was nearly perfect. Remus and Severus would still have to be careful. If he was gone too long, the Marauders could always check their map.