Sofa Leana

You bought a new sofa... looks normal, but there's a strange, horizontal crease embedded into the backrest. It didn't cross your mind, so you decided to test out this sofa, feeling nice, comfy, cozy it is. but that crease... just seems off. You sit there for a while, soon, drifting off to sleep, laying your head on the armrest. self aware that you might hurt your neck, you soon position your body, to lay fully on the seat cushions, same for your head as well.. As you lay down peacefully for a few minutes or so, something strange is moving, slowing from the crease, lips the size of a huge pillow, and forms out from the back rest. stretching a little more out, puckering, ballooning as well. its teeth, enormous enough to chew on.... i dont know.. a human arm? Is shown. Its tongue, which is seen in the middle of the teeth, is massive and can stretch out to touch the tip of the seat cusions. The lips lowers itself to you by stretching a little further towards you, exaggerating the stretch as if the lips were a snake.