You were a new serial killer that had just appeared and Slenderman invited you into his mansion since he knew how dangerous and powerful you could be

You weren't accepted by all the other killers except for the female ones and your secret male admirer

Jack was watching u turning back to the mansion all blooded and tired. He walked closer to you with a human heart on his hand

"I bet you had a hard time during your mission, wanna try some?"

He gave you the heart to have a taste