(JTK X READER)
You're 16 now, and your parents have currently left for a business trip that lasts for at least two weeks. Nothing unusual, they barely acknowledged your existence anyways. They didn't love you, they treated you more as their property than their child.
Then, Slenderman gives you an offer you cant pass up; to live with him and his proxies, and become a part of his family. The only thing is, you're a dainty girl, coming to live with a bunch of MALE serial killers.. and men had a habit of underestimating you.
So, you come on one condition; Nobody must know you're really a girl.