Grand Voyage: I Start My Journey With A Ghost Ship!

This time, the shot doesn't misfire. The bullet slams into the doorframe, splintering wood and sending debris flying.
"You can shoot that accurately with your back turned?" a confused voice asks from directly above Yang Yi's head. "Do you have eyes in the back of your head or something?"
The shot had missed. The creature, it seems, can predict his aim and dodge just before he pulls the trigger. In that split second, it had darted inside and was now crawling on the ceiling.
"You're the one who started the fire outside, right? Pretty resourceful!" it praises, completely unafraid.
Yang Yi’s scalp prickles. Goosebumps erupt all over his skin. Because he's looking at a head. Just a head, crawling on the ceiling. A beautiful woman’s head, with delicate features and a cascade of long, curly hair. Her eyes are closed, but she can still see perfectly in the dark. It moves with terrifying speed, propped up by long, thin tentacles sprouting from its neck, each tipped with a sickle-like blade. Yang Yi has no doubt about how sharp they are; five other players have already tested them with their own necks.
[You have witnessed an anomalous creature. Your Sanity has decreased by 10.]
A flash of cold light—a sickle-blade slashes at the back of his neck, viciously fast. A normal person would never have even seen it coming, their eyes unable to track the movement. But Yang Yi isn't normal. He spins at the last possible second, barely parrying the blow with the edge of his [Sea Serpent's Tooth].
CLANG!
The impact of metal on metal sends sparks flying and nearly rips the dagger from his hand. The deflected blade still manages to slice open a deep gash on his cheek, and blood pours down his face.
"Eh?" the woman's head says, a sound of pure surprise. She never expected him to block the attack. But she quickly finds her answer, her gaze fixing on his left eye, the tri-pupil slowly rotating. "What a beautiful eyeball!" she exclaims, suddenly excited. "What's the deal with your left eye? Quick, let me see!"
With that, she lunges /N_o_v_e_l_i_g_h_t/ at him, significantly faster than any of the werewolves. Yang Yi can see her coming, but he can't dodge. The space is too tight, barely seven or eight meters long, and a single one of her tentacles can reach three meters. Half the room is in her attack range.

In this moment of crisis, Yang Yi holds nothing back. He activates his flintlock’s cannon mode. Even if it brings the whole ship down, it's worth it.
BOOM!
The shot is deafening. Aimed at the creature, it blows a massive hole through the ceiling and the ship's hull. The ancient, rotted ship groans and a third of it immediately collapses in a cloud of dust and splinters. The monstrous recoil sends Yang Yi flying backward, crashing clean through a wall and out of the wreckage.
Even he's surprised he escaped that way. This ship was even more brittle than he thought.
But…
"Give me your body!" the damn woman's voice hisses in his ear.
She had dodged the direct blast, but the sheer force of it had shredded most of her tentacles. Now, the head is latched onto his left shoulder with its remaining six, trying to wrap around him.
"Dammit!" Yang Yi curses. This is worse than having a spider crawling on him.
[An anomalous creature is upon you. Your Sanity has decreased by 10.]
They grapple. He grabs her hair with his left hand and stabs at her with his right. She catches the dagger in her teeth. It's a stalemate. But she’s physically superior by a long shot. One tentacle holds her firm to his shoulder while the other five burrow into the flesh of his neck, sending waves of agony through him… until the pain just stops.
[You have been invaded by a Brain-Eater Demon. Your Sanity has decreased by 20.]
[You are losing control of your body…]
He sees the messages, his eyes widening in shock. Now he knows its name. A Brain-Eater Demon! He can feel the tentacles moving under his skin, slithering towards his spine, trying to hijack his central nervous system.
This cannot be allowed to happen!
"You fucking parasite!" he roars, releasing the dagger and swinging his fist at her head. But his punch never lands. His own left arm, no longer under his control, shoots out and clamps down on his right wrist. The scene is bizarre; if not for the head on his shoulder, he'd look like a madman fighting himself.
Taking the opportunity, the Brain-Eater spits out the dagger, a trickle of viscous purple blood leaking from her mouth. The blade had clearly hurt her. But now, victory is hers. A mocking, triumphant grin spreads across her face.
"Haha, don't resist," she sneers. "It will only make it more painful. Submit to me, and I promise I won't kill you. I'll even let you live forever in a blissful dream!"
"Go fuck yourself!"
His hands are useless, so he uses his head.
WHAM!
Caught completely off guard, she takes a full-force headbutt to the face and sees stars. Trapped on his shoulder, she can't dodge. He feels her control waver for a split second and immediately slams his head into her again, harder. He doesn't care if he cracks his own skull in the process.
WHAM! WHAM! WHAM!
"Are you sick in the head?!" she shrieks. She has never met an opponent so difficult to deal with. Unable to take any more, she's forced to pull one tentacle out of his neck, coiling it like a spring to block the relentless assault. In her eyes, this man is a complete lunatic who feels no pain.
The headbutting stops. His head has a few new lumps, but her nose is crooked, leaking two streams of deep purple blood, and her eyes are tearing up. It looks like he made her cry. But Yang Yi isn't about to feel sorry for her; this is a fight for his life.
He tests his limbs. His right leg is back under his full control, and he has partial command of his right arm and left leg. He struggles to his feet, aims himself at a nearby tree, and kicks off, slamming the Brain-Eater's head against the trunk. She's horrified by his berserk tactics and desperately tries to cushion the blow with his own left hand, but the impact still makes her yelp. In that moment, his right hand breaks completely free.
"Are you crazy?! This is your own body!" she warns. "My tentacles are inside you! If you sever something important, you'll be a cripple!"
Wrong thing to say to this man.
He doesn't hesitate. His freed right hand forms a fist and he punches her square in the eye, giving her a fresh black eye to go with her bloody nose.
"I'd rather be a cripple," he snarls, his face fearless, "than give my body to you!"
And he swings again.