This fic ambushed me in an alley and clubbed me over the head, inspiring me to write it in a single day. A heavy dose of angst and dark topics to break up my more typical hurt/comfort!

Content warnings for: possession, loss of control, powerlessness, self-sacrifice

Prompt by sapphireswimming: "Plasmius is an evil ghost that has possessed Vlad since his accident. Vlad fights back as much as he can – silently apologizing to overshadowed businessmen while they share a mind, diverting malicious attention away from Jack and Maddie, and holding back against Danny long enough for him to learn Plasmius' weaknesses – but he won't be able to on much longer"

Plasmius, Vlad was sure, was the world's punishment for any and all bad thoughts he had ever had. It was the harshest wake-up call imaginable… and unimaginable. Because, honestly, who could ever believe such a thing?

With the power of hindsight, Vlad had come to know, and acknowledge, that he'd been an awful human being. In college, he had constantly shunned Jack's kindness, every attempt at friendship despite Vlad's prickly responses. And Maddie… Oh, Maddie. He had refused to accept her interest in Jack, sure that he just had to convince her that Vlad was the better choice.

He'd been toxic, from top to bottom. That, Vlad was sure of.

It was not all that surprising, then, that this flaw of personality drew in equally toxic ghosts. Or, one ghost, specifically. A type of spectral parasite, which latched onto Vlad during the accident with the Proto Portal.

Vlad had not been in a good place, back then. He'd been in pain, horribly mutilated. Had been going through an experience no one else knew of, could sympathize or help with.

And all of that had been so much, that Vlad honestly hadn't even realize that part of it wasn't his newfound part ghost nature. Part of it had been a parasite, possessing him.

It had started slow. Had whispered bad thoughts into Vlad's ear, its core pressed against Vlad's until they were impossible to tell apart.

Had they ever truly been separate? Vlad didn't know. Maybe not. Maybe he had only ever become half-ghost because a full ghost had possessed him.

Because that was what this was. Possession. Most people think that there is no difference between overshadowing and possession, but there is. It was just that most ghosts wouldn't lower themselves to possession. There was no point to it, really, for most ghosts. It would allow them a foothold in the human world, yes, but it came with severe weakening. With a constant struggle to overpower the human they mingled with.

Plasmius had gotten lucky. He'd gotten his claws on Vlad just when he'd been sick, and weak, and ecto-contaminated.

And Plasmius had dug his talons in until Vlad couldn't throw the ghost off anymore. Plasmius had integrated himself so neatly into Vlad's very anatomy that removing him would surely kill the both of them.

The ghost had waited until Vlad was at his weakest, most inclined to listen to the venomous thoughts in his head, and then lunged. Had hard-handedly torn the steering wheel out of Vlad's hands, pushing him into the crevices of his own mind, his own body.

At first, Vlad had let him. Plasmius wasn't held back by any of Vlad's weakness, his sickness, his lack of control. Plasmius wielded their ghost powers like an expert—because he was, really, an expert. Plasmius settled the ectoplasm and the flesh into their right forms, into a perfect mixture of the two, until their body was no longer wracked by sickness.

Plasmius dreamt of the things that Vlad wanted. Of getting riches, of getting revenge on those who hurt them, of getting the love they deserve.

Sometimes, Vlad wondered if he had influenced Plasmius right back. If he had carved the ghost's mind into the same patterns as his own. Most times, however, he decided it didn't matter. They had long surpassed the part where Vlad could influence Plasmius.

Freed from the hold of the hospital, of their sickness and weakness, Vlad had rejoiced. With Plasmius' help, even his skin cleared up, scars fading away like nothing had ever even happened.

He'd asked, foolishly, what he could do for Plasmius to repay him for services rendered.

And Plasmius had laughed, in their shared mind space. Had cackled, sharp and vicious and unkind in every way.

"You won't do anything, anymore," Plasmius had told him. And after that, Vlad couldn't remember anything.

The memories got muddled, then. Plasmius had torn control away from Vlad entirely. The only things he knew was what the ghost had accidentally slipped through into their shared space.

It was something about the way the ghost was constructed, Vlad thought. He could have his thoughts to his own, and speak to Plasmius only when he wanted to, but the ghost could not. All of Plasmius' thoughts were direct, and easy to read.

They were the only thing Vlad knew, most of the time. He had no input from his body, from their shared body. Nothing from outside. Nothing but Plasmius' thoughts.

So, over the years, Vlad had had a lot of time to think, and to reflect. To realize his many mistakes. To vow to do better.

Occasionally, Vlad was joined in the mind space by another mind. The first time it had startled him, but he knew what had caused it. Plasmius desired money, because money was power in the human world. But Plasmius was no businessman, had no financial smarts.

Instead, the ghost used the thing he did know: his ghostly abilities. Plasmius overshadowed businessman after businessman, forcing them to give their possessions, their riches and businesses, to Vlad. Or, more accurately, to Plasmius in Vlad's body.

And, every time Plasmius overshadowed someone, the poor soul would gain temporary access to their mind space.

At first, Vlad apologized to every person Plasmius overshadowed. The businessmen, especially, he silently apologized to. Silently, because he didn't want to draw Plasmius' anger, his ire. The ghost probably couldn't do him any harm, but the same could not be said of the people he overshadowed.

Later on, after Vlad realized what Plasmius was planning for their future, he started asking people to stop them. To stop him. He apologized first, of course, but then pressed on to point fingers at Plasmius. Begged people to please, please, inform authorities of Vlad Masters, dangerous half-ghost.

Plasmius had to be stopped, even if that came as the cost of Vlad's life.

Nothing ever came of it. He didn't know why. Didn't know what to change so he could just convince someone.

Vlad Masters became a rich man. The proud owner of a Wisconsin mansion, decked out liberally in green and gold and Packers memorabilia. Plasmius, apparently, had decided that the Packers were an interest they shared.

Plasmius' eyes started wandering back to the rest of his list of goals. Of acquiring Maddie's love, of doing away with Jack.

And Vlad… Vlad thought back of all the scared businessmen that Plasmius had hurt. Of Maddie's lovely smiles, and of Jack's overly jubilant attempts at friendship.

He steered Plasmius away. To the best of his abilities, of course. He threw up distractions, made suggestions for Plasmius to pursue.

Two decades, he made it last. Two decades of holding off Plasmius, before the ghost finally decided it was time to chase down Jack and Maddie.

Twenty years was a long life, Vlad had consoled himself. And he peeked in on Plasmius' vicious plans, and suggested, meekly, a college reunion.

The invites were sent out in Vlad's name, of course. Two of them went to a little town by the name of Amity Park, addressed to Jack and Maddie Fenton. Plasmius had been beyond anger, but Vlad…

Vlad was glad. He was happy that those two had found support and love in each other. That they hadn't been driven apart by his own accident.

Plasmius was still gunning for Jack, Vlad knew. Was sending all matter of ghosts after the man, yet none of them had succeeded. The few that dared to return to the mansion explained that another ghost had stopped them.

This, Vlad realized, was driving Plasmius crazy. The ghost decided, apparently, that he would just do the job himself.

See, Vlad had steered Plasmius towards a college reunion in the hopes that the ghost wouldn't be crazy enough to murder Jack Fenton with so many witnesses. Now, he had started to worry that that might not be the case.

He had still been busy wondering if Jack and Maddie had held onto their interest in ghost hunting when Plasmius got agitated all over again. The ghost that had thwarted Plasmius' attempts at killing Jack in Amity had come along.

Danny Phantom. The half-ghost son of Jack and Maddie Fenton.

Plasmius had tacked another goal onto his to-do list. To kill Jack, to acquire Maddie's love, and to destroy Danny.

"Why not recruit him?" Vlad had asked, foolishly. "Isn't he like us/you?"

This, apparently, had been the wrong thing to say. Plasmius had gotten even more agitated.

As it turned out, little Danny Fenton-Phantom was an actual half-ghost. They were a thing of legend, something that no one thought could exist. Plasmius had designed their shared body with this in mind. No one would be able to tell that Vlad was possessed, because they would be unaware of what was normal for a half-ghost like them.

Danny, however, would know. Or would lead others to know.

So the boy had to be destroyed, lest anyone else figure out what was wrong with Vlad.

And Vlad had looked at this teenager, this boy barely fourteen years old, and prayed for forgiveness for what he was about to do.

He had started pushing. Prodding Plasmius into lashing out, into making more and more vicious plans, in revealing his hand. And, simultaneously, in coaxing Danny to find their weaknesses. Steering the boy into knowing what Plasmius could do, and how to take him down.

Danny had to know that Vlad Masters—Vlad Plasmius, apparently—was trying to kill him. All Vlad needed for him was to get too fed up, go too far.

To end it. Before Plasmius could do worse.

Plasmius had another plan to take out Danny. Daniel, the ghost insisted on calling him. Plasmius had never been very good at respecting other people's desires.

Vlad no longer wondered where that came from, either.

But his strength was waning. His ability to influence Plasmius lessened and lessened.

Which is why they were in the Fentons' lab, now. They were fighting, Vlad thought, but he had no way to really know. Plasmius had locked him out of his own body twenty years ago, and had never let up.

So when Vlad suddenly thudded against a hard floor, cold against his bare hands, staring up at a blue face with blank red eyes and fangs, well.

He might've screamed.

A bolt of green knocked the ghost away from him, and it—he, something in Vlad's mind told him this was Plasmius—snarled.

"Oh no you don't!" a youthful voice yelled. Vlad didn't look at the source, too busy taking in the ghost that had inhabited his body for all those years.

Pallid blue skin, only visible on the face and part of the neck. The eyes were entirely red, with no way to distinguish sclera from iris from pupil. Black hair, swept strangely in the shape of horns, and a matching black goatee. Pointed ears, and overlong fangs, which the ghost bared at either Vlad or whoever had yelled.

The clothing was a strange mix of vampire-like and lab clothes. Mostly white, the shirt tunic-like but with a tight shiny collar and gloves. A big cape, though, flaring out and red on the inside.

Plasmius snarled again, and Vlad could see, now, that his fingers were sharp like claws.

"Alright, that's enough out of you," the voice behind Vlad decided, and another bolt of green blasted against Plasmius.

Naturally, this only riled the ghost up more. He pushed himself up, lunging forward at Vlad.

A blue vortex caught him before he made it all the way, and the ghost was sucked up. Vlad followed the stream, repressing his surprise at the fact that his body let him, and saw…

Well, it must be Danny Fenton-Phantom. Just a boy, dressed in a black jumpsuit that reminded Vlad of the ones Jack always liked so much. Messy hair, an unnatural white, and glowing green eyes.

"Seriously, Vlad, what's wrong with this guy?" Danny asked him, shaking the device that Plasmius had been sucked into. "I thought that taking you through the Ghost Catcher would help me understand you better, but this just made me more confused."

Vlad blinked at him. "The… huh?"

"The Ghost Catcher," Danny repeated, like that was the only part that could've confused Vlad. He gestured next to him, at a giant dreamcatcher-like invention. Its net glowed an eerie ectoplasmic green.

Yeah, that looked like something Jack might put together.

"What did… How did…?"

"You are seriously out of it," Danny commented, frowning at him. "Your ghost half was all snarly, so I figured you were the smart half, but now I'm starting to doubt that."

Danny had separated them, somehow. For twenty years, Vlad had thought that that would be impossible. From the moment Plasmius rewrote his body to be half human and half ghost, he thought it would've killed them both.

"How?" he asked again. He had to know. Could they destroy Plasmius, did he have the time—the strength—to do it himself?

"The Ghost Catcher." Danny shook his head, watched as Vlad pushed himself into a sitting position. "It takes all the ectoplasm out of your system. When I went through it I got two distinct personalities, so I figured I would try it with you, but…"

Danny trailed off, then shrugged. "You're not as mean as before, though, so I guess your feral half took that."

"It was always his to begin with," Vlad scoffed. He tried standing up, but wobbled precariously. Danny caught him by the arm before he fell, though.

"Well, yeah, I guess most of your anger came from the accident that made you a half-ghost, but—"

"No," Vlad interrupted him. "The accident didn't make me half-ghost. He did."

Danny rolled his eyes, dropping Vlad's arm. "Yeah, yeah, I know. You always blame my dad for it."

"That's not what I was saying at all." Vlad shook his head, but let his eyes wander back to the… what did Danny call it? The Ghost Catcher? "The accident with the Proto Portal didn't make me half-ghost either. Not directly, at least. I've got myself to blame at least as much as your parents."

"Oh, uh." Danny blinked at him, apparently surprised at the admission. "I mean, I guess that the Portal gave you Ecto Acne, and then that made you—"

"Plasmius made me half-ghost." Vlad tore his eyes off of the miraculous invention, back towards Danny. Back towards the device in his hand that held Plasmius. "We need to destroy him, before he gets out."

"Woah, woah." Danny held up his hands. "That's a little extreme, isn't it? I mean, my two halves didn't like each other that much either, but—"

"You don't get it, Danny!" Vlad snapped. His heart thumped in his chest, blood roaring through his ears. Sensations he'd missed for twenty years while Plasmius paraded his body around. "You're a real half-ghost. I never was. I was human, and Plasmius was the ghost who possessed me. Why do you think he wanted you gone so badly?"

The boy stared at him, so still that Vlad wondered if he still had to breathe in his ghost form.

"You… called me Danny," he finally said, quietly.

Vlad resisted the urge to throw his hands in the air. "Yes," he snapped, then stamped down his anger as well. He could be angry later, when Plasmius was gone for good.

"Yes," he repeated, more calmly. "I've been referring to you as Danny the whole time, since you've said that that was your name. I… I have had a lot of time to think. To realize the mistakes I've made in my life." To repent, he thought, but didn't say. To realize that he'd been so terrible that no one saw the difference between him and Plasmius.

"I… I don't know if you can live without your ghost half," Danny said, eventually, reluctantly. "If you've been half-ghost for twenty years, like Plasmius always said…"

"I don't care. If I die… so be it." Vlad ran a hand through his hair, startled to find it tied back into a ponytail. At least Plasmius had kept their hair long, he supposed. "He has been puppeteering my body for twenty years, Danny. The only things I knew for twenty years were his thoughts, and his thoughts only. I had no control, could only make suggestions, and he's been getting harder and harder to influence as time moved on."

"That's why he always held back." Danny's eyes grew wide. "I wondered about that. Why you—he, whatever—never used the full power of twenty years of experience. You held him back."

Vlad nodded. "I wanted you to figure out his weaknesses. To grow strong enough to… to put an end to it."

"You wanted me to kill you. Both of you," Danny realized, his voice dropping.

"It would've been a bad thing to put on you," Vlad agreed. "But the alternative would've been worse. Plasmius… he couldn't be stopped. For twenty years, I derailed him into focusing on wealth, on acquiring power, but he finally set himself on his original goals. He would've killed Jack, would've found a way, no matter how despicable, to make Maddie his own. When he found you, a real half-ghost, he added your destruction to your list. And once he had achieved all those goals?" Vlad scoffed. "It would've been awful. Plasmius has no compassion, no caring."

"So you wanted me to kill you? To put blood on the hands of a fourteen year old?"

"Better to hurt one teenager than to kill dozens. Or more, perhaps." Vlad shook his head. "Even if it was the wrong thing to do, it doesn't matter anymore. You've found a solution to split him off without shedding any blood. Now we just need to destroy him, permanently."

Danny's hands tightened around the tube-like device. "I— I can't. I'm not gonna kill some ghost just based on— I can't just kill some ghost."

"Then give me some kind of invention from your parents and I'll do it myself." Vlad drew back his shoulders. "He needs to be gone, Danny. I've lost twenty years of my life to him. He has hurt countless people, and would hurt far more. Will hurt many more, if you let him out."

The boy shook his head. "I can't let that happen. He can stay in the Thermos."

"Sooner or later he'll break out of that," Vlad insisted. He couldn't… couldn't risk that. Never again. "Or someone will release him."

"I'll bury it." Danny met Vlad's gaze. Stubborn to no end. Not very surprising, Vlad supposed, knowing the boy's parents. Both Jack and Maddie were not known for giving up.

"It'll get dug up." Vlad stared at Danny, tried to will him into understanding. "Danny. I know you don't like this. It's a cruel thing to ask of a boy your age. To ask of anyone, really. Give me the… the Thermos, and your parents and I can take care of it. They're still ghost hunters, aren't they?"

"I…" He bit his lip, looking down at the Thermos in his hands. "I… I don't think that that's a good idea. They think that all ghosts are like that. This will just be— be proof that I don't want them to have. They'll think that all half-ghosts are like that."

"That I'm like that" went unsaid, but Vlad heard it anyway.

"They don't have to know that Plasmius possessed me all this time," Vlad insisted. He needed the ghost destroyed. It had to happen, no matter what. "I just need him gone, Danny. I need to know that he will never hurt anyone ever again."

"I just… I can't let that happen." Danny shook his head, slowly moving his arm until the Thermos clipped onto his belt. "He'll add to my parents' proof of how bad ghosts are, and even if I let you three deal with him… What's stopping him from just possessing you again? Or one of my parents?"

Danny shook his head again, the movement sharper, jerkier. "I… I've dealt with bad ghosts like him before. That one, I left locked in a Thermos at Clockwork's tower. I'll do that with Plasmius too."

"In the Ghost Zone?" It was not ideal, but… the Thermos would not decay in the Zone, and no ghost would be crazy enough to mess with such a device. And even if Plasmius broke out, it would take forever for him to get back.

"Yeah. Is that a good compromise?"

Vlad nodded, reluctantly. "As good as we'll get, I think." He paused, looking around the lab. "Excuse me for asking another thing of you, Danny, but… I'm afraid that I have no explanation for your parents as to why I'm in their lab."

"Right, yeah." He shot Vlad a suspicious look. "This isn't a plot to steal the Thermos from me, is it?"

"I promise to you, it is not." He placed a hand against his chest and realized, belatedly, that he was wearing a suit. Since when did he wear suits? What was Plasmius thinking? "Bind my hands if you must."

"Alright, no need to go so far." Danny rolled his eyes, walking closer to Vlad. "If I get you to the street, will you manage from there?"

Vlad patted his pocket, feeling a hard shape. He took it out to reveal…

"You have a phone, good." Danny nodded. "You can call for a cab and take your private plane back to Wisconsin, or however you got here. How did you get here?"

"Bold of you to presume I know." Vlad sighed, placing the phone back into his pocket. "I might just… take a walk, first. It has been a long time since I could."

Danny threw him a heavy look. "Yeah. Of course. I won't stop you."

"And I…" Vlad paused. "I would like to reacquaint myself with your parents. I know that, between my behavior in my youth, and Plasmius' behavior in more recent times, I don't deserve that, but… I have learned my lesson a long time ago."

This, Danny needed time to process. "You're… not after my mom anymore?"

"I wouldn't dare," Vlad assured him. "When Plasmius sent out the invites, I caught wind of their marriage. I was… very glad. It was wrong of me to ever continue to pursue Maddie, when she clearly had no interest in me."

"Then you're welcome back, I guess." Danny reached for him, and Vlad let him. Let the boy wrap his cool hands around Vlad's arms. "I'll let Jazz know not to get too harsh on you, but I can't do anything for my mom."

"Ah. Yes, a Maddie scorned is a Maddie to fear." Vlad nodded understandingly. "Jack… Jack, I am sorry to say, I never appreciated as I should've. I would be glad to accept his offer of friendship this time around."

Danny lifted him with ease, like gravity suddenly stopped having an effect on Vlad. "Yes, I… I am sure that Dad would love that. And if you try, Mom will see that, too. It'll be…"

"I'll do my best," Vlad promised, after Danny had remained silent.

The boy nodded, then lifted up further. Phased them straight through the ceiling, which led them into the upstairs living room, and then through the wall. Carried Vlad a little further, until they were out of sight from the house.

"I'll let you wander around first, then." Danny put him down, surprisingly gently. "Come by whenever you're ready, Vladdie."

Vlad smiled back at Danny, feeling something warm and hopeful bloom in his chest. "I will, my boy. And… thank you. For your help with all this. For allowing me to finally be my own person, away from Plasmius. I didn't— didn't think it would ever happen."

"Glad to be of service, then." Danny bowed, deep, but rose with a smile on his face. "I'll get this Thermos hidden away somewhere where no one will find it for the next eternity. Have a nice day, Vlad!"

"Yes, you too, Danny Phantom." Vlad felt the corner of his mouth twitch up. Danny waved, then promptly disappeared from sight.

Vlad waited for another moment. Felt the mild wind breeze past him, tug on his long hair and his suit jacket.

It was good to be alive.

I didn't get to work it into the fic properly, because Danny wouldn't just go and share this kind of information willy-nilly, but Plasmius is absolutely the reason why 'future Danny'/Dark Danny/Dan went crazy, at least in this AU. At that point in time he had no goals left (he had the money, Jack was dead, and Maddie could only be found to love if she became a ghost) besides destroying Danny, and separating the human and ghost halves would accomplish that. Plasmius, as a parasitic ghost, overwhelmed Phantom, thus allowing for the evil full ghost, who was now so powerful that there really was no reason to possess anyone anymore. (he did catch Danny/Phantom's anger and let it give him some goals, though, hence his destruction of Amity)

Vlad is not a bad man, but his ethics are a little skewed. He knows that driving Danny to kill him was a bad thing, but he also saw no better options. He's got a long way to go to learn how to be a good person, now.