Harry followed the tall figure into the denser forest. Eventually the moonlight was blocked out by the criss-crossing branches overhead. Once they were completely in the dark, Harry felt something like a gust of cool wind, but it felt as though the world were shifting around in the darkness as well. It wasn't uncomfortable; actually, it was a bit exciting. He suspected this was what those roller coaster things were like that Dudley rode on at amusement parks.
When the feeling stopped, Harry looked around and saw that they were, again, in a forest. Though, he took a breath and noticed the air smelled different. Looking up, he saw the moon was shifted from the position they'd left.
"… um… excuse me… sir?" He asked tentatively.
The figure looked down (even though he didn't have eyes) giving the young child his attention.
"W-where are we?"
The figure nodded. Again, the voice returned. It sounded like it was coming from the tall man, but it was purely from Harry's own mind. "I am glad you sensed the change. As for the formalities, my name is the Slenderman. One word. Though you will find some of my… associates call me 'Slendy'. To answer your question, we are in the rural forest of the Northeast Coast of America.
"Oh, well, my name is Harry. Harry Potter. Two words. We're all the way in America?" Harry thought back. He remembered a history lesson about a place called America. It was supposed to be short for their real title; The United States of America. They hadn't learned much yet besides they separated from Britain a long time ago and helped out in wars.
"Yes. New York State, to be exact." Slenderman replied.
Harry remembered seeing a globe once in the classroom. "Isn't that like a million miles away?"
The Slenderman- gave an echo-y mind-chuckle. "3,300 miles to be exact."
"Wow!" The child whispered. He'd never been anywhere outside of Little Whinging. "How'd we get all the way here?"
The faceless entity gave the impression of smiling. "Just something I do."
The pair continued walking in silence through the dark forest. Harry listened as the dead branches, mulch, and gravel crunched under their feet. After some time, he looked around and saw a drawing tacked onto the tree with a figure that looked distinctly like the entity next to him.
"Mr. Slenderman, what's that?" He pointed.
"That, Harry, is the artwork of an individual who lives nearby. She draws all of us, though she has the tendency to draw me and put them up in the surrounding forest. I believe it is her idea of a game. That or she thinks I won't see it unless she puts them out in the forest." Slenderman responded. "She lives with me and many others like myself in a mansion up ahead. That is where I am taking you. I have an associate who deals with medicine. He can help you."
Harry nodded. He'd never been to the doctor before. Once, he was sent to the nurse after Dudley beat him up again (his cousin got away with it unseen, of course), but the Dursleys were livid about it when she mentioned the bruises. They immediately blamed it on his "delinquent behavior".
They continued walking for a few minutes before Harry made out a faint, yellow glow in the distance. As they approached, Harry's eyes adjusted and right in the center of the forest was a large mansion. Harry couldn't make out many details, but from the windows, it must have been at least three stories high.
He and Slenderman walked up to the front wrap-around porch and the older entity opened the slightly-taller-than-normal door and ushered him inside.
Harry looked around in awe at the foyer. He'd honestly expected something a bit more dilapidated, but everything here would probably make the Dursleys green with envy. The wallpaper was an old-fashioned blue and black floral design. The wood floors and panels were all the same dark oak. A few portraits were hung on the walls, but it wasn't too decorated aside from a mirror and end table against the wall, a chandelier, and a grandfather clock ticking away in the corner.
Slenderman led him through an archway to another room. This one had a red and maroon floral design, lots of chairs and couches, a few end tables, and a currently-vacant fireplace.
"Please wait here, Harry. I need to go find Jack, my associate, so he can give you proper medical treatment."
Harry nodded and watched as the figure walked out of the room. Harry noticed that the ceilings were slightly higher than normal as the tall entity didn't have to crouch down to get under the archway.
Being slightly less energetic than most seven year olds, Harry was content to sit on the winged armchair and look around the room he was in. More portraits were lined up against the walls. Looking closer, he saw some were fairly normal: fruit, landscapes, and a few animals. However, he caught a few glimpses of some paintings the Dursleys wouldn't let anywhere inside their house.
One depicted a man, or at least what was left of him. The skeletal remains were probably in the same regal position as the original man, but the eyes, nose, and skin was rotted away and a few straggly white hairs clung to the skull. Another had landscapes of black trees and fog. One had a crow perched on a vacant armchair eyeing the observer. Harry got the distinct impression it was smirking at some silent joke.
Harry wasn't unsettled by them. He actually thought they looked very cool. The Dursleys strove to be "normal" by their definition and, as such, their pictures were replicas of paintings of fruit, fake idealized landscapes, and, of course, picture upon picture of Dudley at various ages. It all became rather boring.
He was drawn to one portrait that he dared to leave his chair quickly to look at.
He recognized Slenderman on the right, but he saw three others with him. One was a figure that looked almost exactly like him, save for some glasses perched on a non-existent nose to correct vision for non-existent eyes and he wore a somewhat fashionable tan sweater. Another looked remarkably similar to Slenderman save for a large, toothy grin splitting his face. Harry was slightly unsettled, it seemed vaguely predatory. The grinning figure wore a grey fedora and trench coat, but a bright, red rose was in its hand, giving some color.