Tentacle pits are common elements in things like hentai (obviously, tentacle hentai). A tentacle pit is a monster that resemble a small place full of tentacles, that's why it's called tentacle pit. It's basically a pit full of tentacles.
Gosh, I hate tentacle hentai. Yesterday I watched a anime without knowing it was a hentai, and it had a scene where a girl got trapped into a tentacle pit and were raped by the tentacles. Disgusting.
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