"Absolutely not Mr Hamada!"

Professor Granville had vehemently rejected Hiro's proposal leaving Hiro in a sour mood. He hadn't thought of a backup, and if it wasn't for Tadashi's idea he wouldn't have thought about the science fair whatsoever.

He had been easily coasting at SFIT. Despite being 14 years old, the classes were exceedingly easy and even with Big Hero 6 taking up the majority of his spare time due to the villain problem in San Fransokyo he hadn't found the school to be a challenge whatsoever. It seemed the only exception to that rule was Professor Granville who was twice as hard on him as the other students.

And the annoying thing was, it wasn't that her lessons were particularly hard. When push came to shove, usually 2am in the morning before something was due, he always produced exemplary work that would ordinarily blow a teacher away. But not Granville.

She was just so incredibly vexing. She caught every second of late attendance or when his attention was slipping class.

It didn't help that the rest of the team didn't seem particularly impressed by Hiro's proposal idea either. They reminded him of how dangerous supercharging was and there was barely any time to prepare something so complicated. Wasabi especially was adamant that he should change his proposal. But Hiro could see the gap in the market. Despite the phenomenal technological advancements in recent years, there was still a huge room for improvement in power which was largely overlooked in favour of flashier innovations.

"I heard that you don't have anything for the Science Fair." An annoying voice broke through his reverie as he stared into the sloppy cafeteria food.

"Not now Karmi." He said dismissively, barely looking up at her.

"I'm just saying, you better get a move on. You might have to repeat the year if you don't… but I suppose that's not entirely unsuspected. I've already finished mine of course. Did you want to see it?"

Hiro's groan of 'not really' wasn't heard over the rest of the team's enthusiasm as they clambered to take turns looking through the microscope that Karmi inconveniently planted right in front of him. Karmi's biology projects were never really that interesting to him… but, he had to give her some credit for this one. It was right up his alley afterall.

She had worked on a new way of controlling nanobots using natural animal swarm behaviour essentially creating bio-inspired nano-robotic swarm. He had wondered why she was poking around asking him about nanobots a few weeks ago, and it looks like she had put his advice to good use. It was only in its rudimentary phases and Hiro could see ways to improve it but the implications were there: it meant that nanotechnology could execute complex tasks inside a living animal.

It irked him that while Karmi had finished her project while he was only met with opposition from Granville. 'Too advance of an undertaking, even for your Mr Hamada' were her words. She even had the absolute nerve to call him arrogant... well, maybe she was right but he sure as hell wasn't going to let this go. He would just have to prove her wrong!

"You don't want to see?" Karmi asked him when he stood up abruptly to leave. She seemed hurt making him feel a little bad. He mumbled something about having to finish his own project and waved absentmindedly to the gang.

Technically he'd be skipping the afternoon period, but he wasn't particularly worried because Granville didn't teach that class and none of the teachers seemed to have a problem with him. Besides, he still had some tinkering to do on Baymax. While he should be fully restored, he hadn't had time to initiate diagnostics before he had to leave for school in the morning and had decided to leave him charging and dormant.

Ducking under the window and bypassing the cafe so Aunt Cass wouldn't notice him home, Hiro headed straight for the garage.

"Ouch." Hiro said unconvincingly.

As expected the health-care robot awakened, scanning him and concluding that while he was healthy, he was sleep deprived and needed to drink more water. The lollipop was an added bonus.

Hiro smiled, plonking himself down in the work chair and kicking his feet up on the desk, allowing himself to sigh heavily. Everything appeared to be in order.

Except for Tadashi.

He hadn't seen him since he had fallen asleep, and he tried his best to get it him of his mind. He was more than convinced that it was some sort of ethereal dream because there was no absolutely no logical way for Tadashi to be back.

"Tadashi? Are you here?" Hiro said quietly, but hopefully, for the second time that day.

"Hiro, would you like to see videos of Tadashi?" Baymax's soothing voice asked from behind him. Tadashi wasn't here.

"I… uh… not now, Baymax." He hadn't been able to bring himself to look back through Baymax's recordings since the first time the robot had showed him. It hurt too much.

As for Tadashi… Everything had felt so real. He was quite possibly going crazy. Maybe he should update Baymax's mental health database? No… The thought of talking to Baymax about his feelings was somehow comical, even if he was a healthcare professional.

But what he did know was real was the proposal idea Tadashi had left him. The energy amplifier to minimize energy loss. But without the guidance of his ghostly brother, even Hiro didn't have enough of a starting point to actually pull off the feat in the given amount of time. Most of the students had been working on their projects since the beginning of the semester. If he weren't starting from scratch it wouldn't have been a problem.

The thing is, he just didn't have any tech to base it off. As far as he knew, this was new territory. He knew a general endpoint. Only a few months ago when he had finally brought Baymax back, Yama had tried to steal a powerful magnetic energy 'paperweight' that amplified energy and had almost sent Baymax into orbit. But overall he was aiming for something with a bit more control than that.. But no less powerful.

Hiro groaned again, leaning forward and burying his head on his hands heavily enough to stir the mouse and wake his monitor up.

"Huh?" He uttered to himself, a news article that he didn't recall reading was on the screen dating twelve years ago.

"Failed Krei Tech Prototype May Cloud Future of Energy Evolution." Baymax said helpfully behind him, reading out the article headline.

'I've researched a little bit into it myself before I settled on Baymax. It wasn't really my sort of thing but, I can help you with a starting point. You're on your own from there though!'. Is this what Tadashi had meant by a starting point?

An hour of research later taught him nothing other than the failed project was still located at Krei Tech and that the technology was considered highly unstable and unattainable. That just made him want to make it even more. Besides, Krei was renown for launching products too soon, he highly doubted success was impossible.

Maybe it would be worth a visit to Krei? The entrepreneur certainly owed Big Hero 6 more than a few dozen favors… that being said, Krei did know their secret identities and hadn't been particularly grateful to them in the past.

So… that left him with three options. Start from scratch and most likely fail the semester, come up with a new proposal altogether, or break into Krei Tech and borrow the amplifier.

Option one… sure he had some idea of what to do, but he couldn't think of coding it feasibly in less than a year, let alone a few days.

Option two… made the most sense. And it'd be what his brother and everyone else would want him to do, right?

Option three… But maybe it wouldn't be so bad if he just borrowed it for a little bit. Besides, when he was done he was sure that Alistair Krei would be more than happy to purchase the device off of him so he was really doing him a favor.

It's not like he wanted the energy amplifier for any particular reason other than to prove that he could make it. And maybe Tadashi would want him to complete the proposal… why else would he suggest it?

Hiro shook his head, trying to get the ghost of Tadashi out of it. But this article was proof, wasn't it? He wasn't just making this up and sleepwalking in San Fransokyo. Some sort of energy was keeping Tadashi tied to the earth… what if this was the path to grounding him here permanently?

Ugh. What a wild idea. One step at a time, Hiro!

It looked like everything was going according to his new plan.

Obake observed his young protege through his surveillance cameras which he had set up in Hiro's bedroom and garage when the boy had fallen asleep.

He had also managed to make a few other small changes while he was there.

He also activated his lenses on the other heroes, although one of them, the idiotic mascot had been asleep. The rest had been busy studying and working on their proposals. He gave them a quick vision of Tadashi. No words, only an appearance next to them or in Honey Lemon's case a reflection in her mirror. Just enough to spook them so if Hiro started babbling about seeing a ghost at school he would feel a little less crazy. He didn't want his protege falling into psychosis.

The contact lenses he had fitted the heroes with were naturally dissolvable, so if they hadn't noticed them already they would have already disintegrated which meant he needed another way to get to Hiro.

Baymax had been carelessly left in debug mode from Hiro's abrupt departure making it easy for Obake to make some undetectable minor alterations to his programming.

Obake had also left behind some upgraded 'Buddy Guards'. The drones which were originally created by Krei Industries had proved to be extremely useful due to their ability to fly, but most importantly because of their invisibility using Flexible Display Technology and their ability to camouflage… or in this case, appear as Tadashi Hamada at will they were the perfect devices for his plans.

Hiro had taken the bait, hook, line and sinker and seemed more determined than ever to crack the code behind the energy amplifier. Obake believed he was more than up to the task. His mind was exemplary but there was no way the boy could start from scratch in the timeframe given.

And if he knew Hiro, the boy would be far too stubborn to alter course, especially since it was suggested to him from such a divine intervention.

On most counts, not much had deviated from Obake's original plan.

To begin with he was going to task Globby with stealing the flawed energy amplifier from Krei, as he was sure that it would spark the idea for Hiro to recreate the technology perfectly. He knew that Hiro needed inspiration, the boy was too busy playing superhero to take his academics seriously.

But now there was no need for such a complicated plot to steal the amplifier. Not when Hiro would so willingly give it to his long lost brother. Or should he say lover? Such an interesting little rulebreaker Hiro was.

Hiro had dismissed Baymax and started work in silence. It looked like he was going to at least attempt to create the energy amplifier from scratch. Obake left the surveillance cameras to work on his own nefarious projects. It was near completion, and once Hiro brought him the final piece of the puzzle it would be complete.

Of course, it wasn't just about the destruction of San Fransokyo. If he wanted to do that it would be more than easy to simply deploy a bomb. He just wanted to do it because he could, and he knew Hiro wouldn't be truly his if he had San Fransokyo to turn back to. No, it was better to erase that part of him.

He wasn't sure how many hours had passed until something on the surveillance cameras caught his eye. Hiro had turned the lights off to the garage and made his way upstairs. The teen wore his emotions on his skin, and the irritation from his project was clear on his expression and the way he was walking.

Reaching his room, he walked right past his own bed and stood in front of Tadashi's section of the room. Obake contemplated sending the Buddy Guard to him but decided to watch for a little longer instead.

"Tadashi, are you here?" Hiro asked quietly and hopefully.

If Obake had the capacity to feel empathy he would have felt a little sorry for him. But luckily, he didn't.

The boy approached the bed, got down on his knees and reached deep under, giving the man a great view of Hiro's perky behind. After a moment the boy drew out a small white box. He sat down on the bed with a huff and dusted off the top. After opening the lid he stared at the contents intently. Frustratingly, Obake wasn't able to get a good look inside and he was curious about what had been hidden away.

He wasn't kept guessing for long.

Putting the box to the side, the teen kicked off his sneakers, quickly followed by shimmying off his baggy cargo pants and underwear in one go. He shrugged off his jacket, but in his adolescent excitement didn't even bother removing his shirt.

He had completely changed from the frustrated Hiro he had been watching earlier. His cheeks were flushed and there was a light sheen on his skin, perspiring from excitement. He was fully-erect and his modest penis was hard, lewdly peeking out from his oversized shirt. Visibly shaking from either nerves or anticipation he reached into the box, drawing out a relatively small but realistic dildo and and a bottle of lube.

Hiro generously squirted lubrication onto a couple of his fingers. Hiro's breaths were hot and heavy as he leant back and tried to relax as he touched himself on his special spot. His eyes squeezed shut and an expression that read more pain the pleasure was evident on his features when his first digit entered. With his spare hand he took a hold of his cock, and the pain escaped his features to be replaced with an audible moan.

Obake smirked, pleased by the further confirmation of Hiro's perverse persuasions. Obake didn't have the capacity to love, and without conscience he was uninhibited in his expression of sexual desires. He now didn't just see Hiro as a potential protege, but also an object of pleasure and satisfaction.

He employed many tools and techniques to influence and control the minds of others. It's how he brought together his villainous friends by playing on their insecurities. While he watched Hiro pleasure himself, he could tell that the boy was out of practice. His awkward movements along with the box seemingly being untouched for at least a year made him believe it had been a while since he had instigated anal play. Apparently seeing his brother again was enough for him to bring back fond memories.

He pondered how he could form an intimate relationship with Hiro. His desire for complete power and control overtaking his obsession to find a free-thinking heir. The easiest route was using Tadashi's image, but while it would work to begin with it would serve irritable and hard to maintain. No, he needed to somehow convert his affections and thus gain his unbridled loyalty, and sexual control was one of the easiest ways, especially in someone still developing their inclinations.

Hiro's panting became heavier as he finally managed to gain some traction working the toy inside of him. The near inaudible word on his hot breath sounding like 'Dashi'. Abandoning his erection, Hiro had rolled onto his knees, face down in his pillow and ass pointed lewdly in the air as he tried to work the dildo in a further inch. The toy was only small in size, the insertable length couldn't have been any longer than 5 inches long and was narrow in circumference, but he was still struggling to penetrate deeper.

Intrigued to find out his reaction, keeping the Buddy Guard in invisible he had the robot come closer to the bed. Activating the voice system, he spoke clearly into the microphone, his voice programmed in real time to convert to that of Tadashi Hamada.

"Just relax Hiro, if you're tense it'll only make it harder." He said calmly. To his amusement, Hiro yelped in surprise, sitting up abruptly to look around. The toy slipped out of his tight entrance with an audible plop.

Blushing a deep crimson the boy had gathered the blankets to cover his lower half. He looked around for the disembodied voice to no avail. "Tadashi? Are you here?" He asked out loud to the dark room. Obake decided it was safer to keep the apparitions at minimum given Hiro's penchant to physical contact.

"I'm always here. I just don't always have enough energy to contact you." Obake knew what he was saying was bullshit, but he knew well enough that even though Hiro was a genius, he was filled with human emotions and irrationality and would willingly pull wool over his own eyes if it meant spending more time with his loved one.

"Energy? Energy! There must be a way to keep you here… just like how you were last night. I could… I could feel you!" Hiro began asking questions to thin air about the afterlife and whether the energy amplifier would be able to bring him back. Obake hadn't considered that leap and pondered briefly on it. If Hiro thought it would help it would definitely make him do absolutely anything to achieve his goal.

"I'm going to be honest with you Hiro… Things work differently here. I don't know how but I think if you successfully build it, you'll be able to keep me grounded." To Obake's disappointment, the earlier mood had dissipated due to his interruption. That wouldn't do at all. "Anyway, why did you stop? I was enjoying watching the show. I want to see how much you've grown." He added slyly.

1½ Years Ago

Ugh, what was Tadashi doing home already? As he stepped into the attic he wasn't expecting to be confronted by his brother.

"Knucklehead, did you use my card to order parts again? You know all you had to do was ask, right?" Tadashi said, noticing Hiro trying to hide a parcel behind his slim waist. "You're not ordering more things for your bot, are you? I thought you quit that."

Hiro tried to escape, but was too slow for his brother's longer limbs which drew him into a tight hug. This wasn't fair! Tadashi knew his weakness! He easily pried the package from behind him and gave Hiro a quick peck on the forehead before releasing him.

He watched Tadashi grab the nearest pair of scissors and easily slice through the stickers sealing the box. Hiro felt like a deer in headlights stuck between fight or flight. It was really tempting for him to run away, knowing what his brother's reaction would be based on their previous conversations on the topic but something kept him stuck there to watch the car crash.

"Oh." Tadashi said simply staring into the contents of the package, crimson appearing on his face all the way to his ears.

Hiro's expression mirrored, blushing furiously he uttered, "I was going to tell you… well, you wouldn't listen… I just wanted to try it." His excuses were mumbled and sounded feeble to his own ears. He remembered the conversations with his big brother vividly.

Hiro and Tadashi had been playing cat and mouse since Hiro's high school graduation. It had quickly become clear that they both had romantic feelings for each other, but Tadashi's pride of playing the role of a good big brother had caused him to distance himself from Hiro and focus on his project Baymax. Hiro in turn had felt somewhat abandoned by Tadashi, and rebelled by entering the realm of bot fighting.

Only recently had they begun to patch things up and be honest with their feelings. Tadashi had argued that while there was a degree of physical attraction between them, they had to work past the feelings and remain platonic. Hiro had boldly countered with his best constructed argument. A full kiss on the lips that was momentarily returned with the same amount of passion.

Thus, a compromise was made much to Hiro's chagrin. They agreed they wouldn't have sex until Hiro was at least 16. It would have been 18 if Hiro hadn't put his foot down.

And yet, only two weeks after that conversation Hiro had already been caught out with a sex toy! In Hiro's defense, he did order it prior to the agreement. And besides, Tadashi hadn't explicitly ruled out using toys.

Tadashi coughed, "It's okay Hiro, I understand." He closed the lid, giving the box back to Hiro. "Just be safe when you're using it." Tadashi then excused himself from the room, but Hiro was perceptive enough to notice the hardening in his pants that he tried to hide. Hiro grinned after Tadashi. Maybe with enough exposure he'd be able to weaken his brother's defenses?

And perhaps with a bit more time he may have, but then he died.

"Remove your shirt." Tadashi's disembodied voice instructed him.

And just like that, Hiro was brought back to the present. He responded a little too energetically, removing his shirt so quickly that it earned him a chuckle. Filling silly, he also removed his socks making him completely nude.

In death, Tadashi seemed so different.

But maybe that was to be expected. In the living world he had to worry about what was right and wrong, but now… it was just them. The earthly societal constructs that bound him were now irrelevant. Maybe this was what Tadashi would have been like without his inhibitions.

"You're thin. You've been too busy with Big Hero 6 that you've been skipping meals. You should take better care of yourself." It was a statement that he couldn't argue with. The villain problem in San Fransokyo was reaching unprecedented levels ever since Big Hero 6 had formed, and even worse still it seemed that they had been gathering under a single leader. Obake.

Obake was a mystery to him. He couldn't understand his motives at all. It was like he was wreaking havoc just for the sake of it. He was sure there was some big end goal but he couldn't foresee what it was. At least all the other villains had some sense behind them.

"Sit back in bed Hiro, hold your legs up. Show me everything." Tadashi's voice brought him back to reality. "Why so shy Hiro? You're usually so brash."

Red with embarrassment, he did as instructed. He rocked back, legs up in the air and hooked his hands behind his knees, clearly exposing his privates. He was almost glad he couldn't see Tadashi because he felt like he was going to die from humiliation. With no one to fix his eyes on, he kept his eyes closed, focusing on his brother's voice.

"Very good, Hiro." Tadashi purred, his voice close to his ear. His heart pounded loudly in his chest in exhilaration. In spite of his humiliating position, Hiro was rock hard again. He had never been so entirely exposed before.

He was instructed to finger himself and was hushed when he tried to feebly protest. Resigned, he pressed a finger against his entrance which slipped in rather easily from the lube residue. It felt good. It felt really good and he didn't need further instruction to continue pistoning in and out as he imagined Tadashi standing over him beating his cock while watching him masturbate.

Hiro had abstained from anal play since his brother's passing. Even though they were never intimate, it reminded him of Tadashi because he always imagined it was his brother teasing and even penetrating him. He had only used the toy a handful of times and Tadashi had ever only walked in on him once and his reaction had been very different. But now the mixture of pleasure and humiliation he felt masturbating in front of Tadashi was overwhelming and he almost came without even touching his own pounding cock.

"Don't come yet, Hiro." Tadashi whispered, bringing him back from the edge, "I want to see you use the toy again. Properly this time."

"O-okay." Hiro agreed nervously, withdrawing his hand and sitting up to re-lubricate the phallus. With his eyes open he was surprised to see Tadashi standing at the end of the bed. He wasn't naked like Hiro had envisioned, but still in the same outfit. The outfit he had died in.

"Stay in bed. I can't hold a corporeal form right now so we can't touch each other." Ghost Tadashi seemed cold and distant, and the gaze he held reminded him of the first few sightings he had of his brother. The uncanny visceral feeling in his body reminding him that he was dealing with something supernatural and outside his scope of understanding. "Go on, what are you waiting for?"

Averting from his cold eyes, Hiro focused on his brother's soft lips as they issued him further instructions. He thought he'd be asked to insert the toy straight away, but he complied when instead he was instructed to run his hands over his body. At some point he closed his eyes again, imagining the touch was from Tadashi.

He gasped sharply when his fingers brushed over his nipples. Hiro had never taken the time to properly explore his body. In the past year, masturbation had turned into a quick duty to clear his mind with pleasure almost an afterthought. Tadashi noticed his nipple sensitivity and told him to focus on them. His penis throbbed and his hips involuntarily bucked at the touch.

He reached down with his left hand to grab a hold of his cock but he was instructed not to touch it. Hiro pined, emitting a shameful noise at having to resist touching his erection. Tadashi suggested to use the dildo again, and keeping his eyes locked on his brother he pressed the tip against his entrance. His body, hot from the foreplay, and with the encouragement of Tadashi accepted the toy with relative ease and he managed to handle 4 of the 5 inches of the insertable length. He breathed heavily, adjusting to the feeling of being filled.

"Good job." Despite the intense delivery, Hiro's heart leapt at being praised by his brother again. He missed that feeling so much. "Now relax, breathe, and work it all the way inside of yourself." Determined to put on a good show, Hiro vowed to do his best.

He forced the rest of the toy inside of him and Hiro moaned so loudly that he was suddenly very glad that he had left Baymax downstairs as he was sure that would have activated him. Panting heavily, he gave himself only a moment to adjust before working it in and out of his body. Tadashi was smiling now but aside from that he had no other reaction.

It felt so demeaning being so naked and exposed, masturbating in front of his fully clothed brother and yet it somehow turned him on even further. Hiro began to lose himself to pleasure, and closed his eyes again as felt himself come closer to orgasm.

He moaned loudly as he released himself without even touching his erection. Cum pooled on his soft stomach and chest as he finally released the dildo, too tired to even remove it. Through his fluttering half closed eyelids he could see his brother disappear.

"Tadashi, wait!" He exclaimed sitting up with renewed vigour, not caring about the mess.

"You did well Hiro! But it's hard for me to hold a form."

He had forgotten. He needed to create the energy amplifier and didn't have time to muddle around figuring out the basic code. Hiro quickly cleaned himself up, glad that there were still tissues on Tadashi's bedside table and got back into his clothes.

"Where are you going?" The disembodied voice asked him, noticing that he was on a mission.

"Krei Tech. I need to… borrow something."

"Borrow something? It's 2am in the morning. You're stealing the failed prototype, right?" Of course Tadashi wouldn't condone such an act, but Tadashi wasn't in a position to stop him.

"No… uhh, it's something else. Official Big Hero 6 business. I'll be back soon."