(Firstly, it might be important to mention this fanfiction was inspired by the amazing Hellbound! A lot will be different but this is just the basic premise.)
Roy Mustang woke up. His head throbbed. What was he doing last? For that matter, what
was he doing now?
He tried to swivel his head. His body complied, alongside some obligatory creaking, twinges of pain. Somebody knocked him out, maybe? The room he was in was almost pitch-black, but as his eyes adjusted he could see the corner of some kind of table, and-
He suppressed a gasp. On the table next to him lay lieutenant Hawkeye, her arm twitching as red sparks jumped through the air around her. She seemed to be alive at the very least, though unlikely that she would be conscious. With dawning horror, he realised that what he could see of her was bloodstained and bruised, like the aftermath of a fight.
Trying not to call out, he assessed his situation. There were bonds on every one of his limbs, and over his torso. The table he was strapped to seemed to be clean enough, cold metal indicative of some sort of operating table. This thought gave him no comfort.
He was- before this. He and Riza had been just talking, in his office, when someone came in. The cleaner? They just ignored him as he cleaned the shelves behind them, and then-
It was the cleaner, wasn't it. Roy cursed himself for his negligence. He had been knocked out first, but the lieutenant must have put up a fight. He was shocked out of his thoughts by encroaching voices in the darkness.
"Of course, we can't have the perfect matches for both of them, not without sacrificing some more of your… pawns, but believe me. I'm making this happen." Another voice rang through the silence.
"I hope you are treating this project with the expertise it needs. I will not tolerate one of my sacrifices being permanently injured." The first voice seemed to shrug this off, laughing quietly before agreeing. They finally reached him, and a surgical mask-clad face loomed over him. The person's eyes were obscured, at least from Roy's angle, by light reflecting off their glasses.
"Colonel Mustang. So glad to see you're awake." Roy gritted his teeth.
"You've had many encounters with the homunculi, I'm sure." The man started. "Artificial humans, created through a philosopher's stone… the work of a genius, if I do say so myself." A pause. He seemed to laugh behind his mask.
"And it seems you have been quite a threat to them, colonel.
So… you and your lieutenant have proved to be too much of a risk. Sadly, you would need to be removed from the equation. And what better way to do that than this?" He lifted up a syringe filled with red liquid, pulsing strangely. Suddenly, Roy knew what was going to happen to him, what might have already happened to Lieutenant Hawkeye.
"Fun, isn't it?"
"Lieutenant!" He screamed. No response.
"Lieutenant Hawkeye!" He tried again. The man seemed to be getting impatient.
"She won't be answering, Colonel. Now to the task at hand."
"What the hell did you do to her?" Mustang all but growled at him.
"Nothing much, nothing much. It went very well, all things considered. Now stay still."
He struggled against his bonds, trying desperately to move his head out of the way of the encroaching needle.
"Accept it, Colonel. Accept it and you may even survive."
Like a snake striking, it pierced his vein. Immediately, his body convulsed in excruciating pain, red sparks traveling down his veins. His body felt like it was being destroyed and regenerated at the same time, over and over and over. He had no control over the animalistic screams ripping themselves from his throat. As his vision faded into blackness, he could just barely see someone rising from the table where Riza lay.