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Luffy's eyes were glazed over as he panted softly, already deep under the pheromone cocktail's effects. As Koby thrust into him with his hand wrapped around Luffy's hip and another tangled in the inky hair, the marine whispered soft apologies and pressed kisses to his face and his shoulders.
Koby's skin prickled, not because the room was cold (it was, but his alpha biology and Luffy's drug-heightened temperature and the fact that they were fucking negated it), but because he knew he was being watched. Half of the wall nearest to him was a one-way mirror. He was certain Garp was behind it, perhaps even an admiral or two, and of course, the contingent of omnipresent scientists and technicians that were always muttering to each other as they took notes on their clipboards.
But even the knowledge that their intimacy was being observed and analyzed did not dull Koby's lust—in that moment, Luffy was all he could see. The pirate was warm and flushed in his arms, his hole spasming around Koby's cock as he rocked into that hot velvet heat and kissed away his low whines.
Garp had been the one to suggest the bitching. Desperate to save his grandson, he had found the loophole (if one could call it that) in Marine law, after Luffy had been captured and scheduled for execution. He had first mentioned it to Koby and Helmeppo, who had helped him research and prepare for the presentation that Garp would eventually give during a senior meeting attended by the admirals and vice-admirals.
Bitching was an archaic method of conquering and subjugating enemy alphas without killing or unnecessary bloodshed, but was no longer widely practised due to the time and manpower required. Koby had only read of it in history books, where it was not described in detail, only that it had originated in a kingdom before the Void Century, and that it was painful and humiliating for the alpha involved.
But Garp had talked to the Special Science Group, and the whitecoats had assured him that with modern medical developments, bitching would be relatively painless and would most likely take a month or so instead of the half-year mentioned in ancient records. That must have been another reason why the method had died out—enemies were easier slaughtered than bitched, thus only valuable alphas of high status whose death would cause more bloodshed than peace had undergone the process.
During the presentation, the Admirals had been skeptical at first. But Garp had described the ancient practice in detail, and the benefits to the Marines were undeniable: preserving Luffy's life would decrease the possibility of his fleet and crew seeking revenge on the Marines, and the risk that another Emperor (obviously Shanks, though his name was not mentioned) would put the Marines in his sights. The Navy and the World Government did not want another war; the costs of rebuilding Marineford had been substantial.
And most importantly, Luffy would not become a martyr, but an example to the so-called "Worst Generation". What greater humiliation would there be than to bitch the alpha poised to be the next pirate king into an omega whore?
Koby disapproved of the lewd way that this was worded during the presentation, but the raucous laughter and murmured agreement across the room meant that Garp had effectively gotten his point across.
When Kizaru asked who Garp had in mind, Koby had immediately leapt to volunteer. His indecision (for Garp had brought up the possibility of Koby's participation when he first described his plan to Koby and Helmeppo) had evaporated after he saw the hungry glint of Akainu's gaze during Garp's presentation. Koby knew the admiral's character now, and he would never allow Akainu to lay a hand on Luffy again.
And privately, Koby could not bear the thought of another marine touching Luffy in this way—he had heard the way the men on the base talked when the news of Luffy's capture had spread, their detailed fantasies of all the lewd and sadistic ways they would use to "put Straw Hat in his place".
The scientists had approved of Koby as well—he was a strong, virile young alpha, and he knew Luffy personally. The head scientist had suggested perhaps the process would be easier with someone the pirate was familiar with, that it was possible the change would take faster if the bitched alpha was given an easier environment to acclimatise and recover in. Thus, Koby was an ideal candidate, especially if the pirate ended up pupped at some point in the bitching process. The probability was low, but both the scientists and the brass had wanted to ensure everything would be accounted for—that there would be no additional complication of possible custody issues. And Koby had been willing.
A tear leaked out of Luffy's half-lidded eyes, and Koby swiped at it hurriedly, his thumb brushing against the ridged scar.
"I'm sorry, Luffy, I really am," he whispered. He slowed his movements, trying to be more gentle with his thrusts.
It was difficult for his lust roared through his veins, aided by Luffy's scent (not omega, but not quite alpha anymore)—the spice and ozone now had a trace of sweetness, like the waft of ripe tropical fruit on a summer island. And Koby had been given a light dose of some drug as well, that heightened his arousal and stamina and increased the quantity of his semen, so that the bitching process would be easier on both him and Luffy.
Koby stroked his hair and make soft comforting noises as the alpha below him wept, and he felt awful guilt as he thrust into him—but he could not deny a part of him reveled in the fact that Luffy, the man he had chased halfway across the Grand Line, one of the Four Emperors of the Sea, was in his arms, soft and panting and clenching on Koby's knot.
It seemed like a dream now, that Luffy used to be almost godlike for how out of reach he was. But in this room and throughout the past week, Koby had learned intimately that he was only flesh and blood.
And so despite himself, Koby kept going.