I was going to detail a little bit more about him, but something odd happened today.
I saw a man that looked like an FBI agent come in, today. The Slender Man had me go into our bedroom, and he locked the door. I could see through the key hole a bit.
The FBI man kept his back to me, and it was dark. I couldn't make out much detail, but I do know that he was being called "Agent F." I don't know who this person is, or why he is speaking to The Slender Man.
After he left, I was let out.