You've lived with Jeff in the slendermansion for a few years now. You've seen his tendencies, and to be fair, he's a freak. A bit of a sadist and a bit of a masochist, has a few odd kinks (biting, toys, shock play, humiliation kink, leash play, bondage). But he kept him to himself mostly, Slenderman didn't approve of stuff like this anyway.

Jeff sat on the edge of his bed, looking at a playboy magazine as he pumped himself between his legs. But he couldn't reach his peak, he needed some type of stimulation. So he put down the magazine where he could see it and bit himself, just on his wrist, clamping down. He swear a minute in he could taste blood, but he didn't care, Infact he went faster as he tasted it. "Mngh..." He groaned. Bit of a sick fuck... That's when his door swung open, you in his doorway.