They emerged on the other side of the Floo in an old barn that Remus frequently used on full moons. He was grateful to have access to a steady supply of Wolfsbane which allowed him to simply curl up in a bed of hay to sleep. The transformation was still incredibly taxing and painful, and he still required a good deal of rest the next day, but the ability to keep his mind in wolf-form was a huge relief.
"See this little bed of hay?" Remus said to Gabe, sitting on the barn floor and patting the spot. "When Dad becomes a wolf, he sleeps here. It's safe because no one can come in. Do you understand, Gabe-y?"
"Can I see?" the boy asked.
"No," Remus replied. "We talked about this. Daddy won't know it's you when he's a wolf, and he'll be very cranky. Remember when you had the flu and your tummy hurt a lot and you cried?"
Gabe nodded a little, clearly a bit hazy on the memory.
"It's like that for daddy. I become a wolf and I don't feel very good, but I get better in the morning, just like you got better."
Gabe turned from his dad and looked expectantly at Tonks.