Charybdis

Encyclopedia Entry:
A monster that lives fixed to the bottom of the sea in a nesting hole like an acorn barnacle. They don’t turn into something and set a trap, but due to their nature, they are classified as a kind of mimic. It is said that there is another dimension conjured from magic that extends inside their nesting holes in the same way as other mimics. Condensed demonic energy is contained in their bodies, so occasionally they release it through holes in their exoskeletons. Due to this, air bubbles often rise from their nesting holes.

In order to get a human man for food and breeding, they periodically generate huge whirlpools focused around their nesting holes. Everything above their hole gets sucked inside. Although they are timid, they are extremely lustful, and when they suck a man into their nesting holes, they spread their vagina open with their own fingers and tempt the man. From their open vagina, they release so much condensed demonic energy that it makes the energy released from the holes in their exoskeleton seem like nothing. The man is showered in it, and in moments his stiff penis will likely be thrust inside her vagina as if it had been sucked in.