Slink

These oily beasties are of a kind I draw periodically, inspired by a Tumblr post I've long since lost track of. I suspect they belong in Menagerie, they may be related to imaginary-but-real creatures like the Bed Monster and the Window Monster and the Closet Monster, and they're surely up to no good.
Slinks are all black, with loose, wrinkly skin that drips an oily substance almost constantly. They have long tails, long limbs, vaguely feline shape (like if a person tried to dress up as a tiger?) and unformed faces. Their mouths are wide, with yellow lips. They have yellow patches around their eyes, too, with sort of "eyelash" shapes. Their eyes are red.