When you accepted the undersea assignment you didn't tell anyone about your deepest fantasies. Outlandish, they'd have said. At best. You never thought they'd come true...
The base...leaked. You went to sleep every night to the thrum of pumps trying to keep up with the constant infiltration of seawater into the lower levels of the...vintage construction. Still, you wake every morning to several inches of water on the floor of your quarters. Of course, waking up in the middle of the night wrapped in tentacles wasn't something you'd expected. Night of course, is a relative term this deep in the ocean, but it's when you turn the lights off to go to sleep. Naked of course, it gets hot and sweaty in the base at the best of time. When you wake, it's to the sensation of pulling - lots of little suckers gripping and tugging gently at your skin as a long, let appendage moves inquisitively over your skin. At first, you think it's a dream. A pleasant dream you've had repeatedly, where you're held down, explored by, and penetrated by a big tentacle monster, and you move your hand to push the tentacle down your body only to find... you can't.
Make your tentacle fantasies a reality with the Monstropus Tentacle Dildo! Crafted in soft, plush silicone wrapped around a firm core, this Monster Dildo is marbled in green, yellow, and blue and features a tapered tip for easy insertion, chunky base, and twin rows of cephalopod suckers separated by a meaty ridge. The entire tentacle is gently undulating with an S-shaped curve, and the entire tentacle is gently ridged for your enjoyment. It also features a suction cup base that easily attaches to any flat, smooth surface for hands free pleasure, and makes the Monstropus compatible with most harnesses if you prefer partnered roleplay over a solo fantasy experience. Just use plenty of water-based lube while you play, and clean up once you're done with warm, soapy water and/or anti-bacterial toy spray.
When the creature finally retreated you scrambled to turn on the lights but you never found out exactly what sort of creature you encountered. Was it a Monster Octopus? A Kraken? Some other intelligent tentacled lifeform? You'll just have to hope it comes back...