Tentacle monster that hides itself inside of a ‘shell’ to perfectly imitate a human. It looks, feels, talks, moves, and acts like a human, if only a pretty big and tall one. It goes to work, has its own place, runs errands, and socializes.
But it might get you alone and split its shell open for all its tentacles to fly out. Binding to keep you from running, caressing your body and fucking every hole you’ve got for hours on end. If you’re lucky, when it’s finished it’ll secrete a substance to knock you out and make you forget about the last few hours, leaving you somewhere and pretending it had nothing to do with your mystery ordeal
But if you’re unlucky (or I guess lucky based on your perspective), it’ll decide it likes you a bit TOO much, sealing its shell with you inside of it with no problem thanks to its size. As it goes back to its daily life, no one will suspect a thing while its tentacles violate all your holes 24/7. Even if you tried to scream, what little sound you could get past the tentacle in your throat will be muted by its shell. The people just inches away from you on the train won’t hear a thing
You can feel vibrations passing through its tentacles as it talks and laughs. Hear the rumbling and squelching around you as it digests its food. Feel its form shift and bend as it moves about. Your entire world is this monster now, both inside and out
