Entropy

He looked to heaven, as if the watching hordes of angels could halt this pain, could prevent his very dermis being sucked into hell.
His tongue had long gone, but the surprise had not been the suck and pop of its demise but rather the continued sucking and tearing of whatever was attached to it.
As the lining of his mouth shifted convincingly towards the back of his throat, so his lips and the skin of his face followed. Each flowed over where the other had been. A slow tide of sludge, as muscle seemed to absorb into this mess-like paste and join the flow. As if agonising, blistering rivers of molten ash, his body choked. A volcano in reverse.
His vision condensed as liquid flesh poured its mould over his sockets and dragged balls and eyes to their eventual demise.
He seemed aware of less and less pain. His body was mostly touching the ground now. Bone and muscle was breaking down and his form had become simple jelly.
Before his nerves and brain joined the chum, he was aware of an amazing feeling, as every part of his body seemed as one cell, one sensation. He may have known everything about sensation and, in a moment, known nothing again.
Teeth joined hungry Charybdis. The sucking demon seemed hungry for the world but soon there was nothing external.
Merely a thick tube led to a grotesque sack. Bulges travelled in the pipe - a python crushing its prey and forcing it ever onwards. Mucus there was, but mucus too joined the vaccuum; the pipe itself drawing eternally internally.
Everything became the sack and the sack, everything. It would have swallowed the sun and drank all the seven seas had the child not merely chosen to swallow himself.