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"Did you put the mods in as I asked?" Tarn lightly traced a clawtip over Pharma's lower lip, down his chin, down his throat cables. Everything looked just as it had before, including Pharma's resentful scowl at the touch. He knew better than to draw back, though. And he knew better than to have disobeyed.
"I did," the Autobot replied, gritting his teeth as if hoping that he could keep his mouth from its intended use.
"Very good. Let's test it, then, shall we?" Tarn turned from his captive and settled himself in the rich armchair in his sitting area. He parted his legs and patted his thigh. "Come join me. On your knees, of course."
Pharma settled himself sullenly on the carpet between Tarn's feet, sitting back on his heels to keep as far away from Tarn's anatomy as possible.
"Now, Doctor, let's not have you looking like that," the tank chided, reaching out to lift Pharma's chin with a clawtip. "You would be much more appealing, and possibly enjoy yourself more, if—"
"Don't tell me to smile," Pharma growled. "I have no interest in being appealing for you."
"Very well, then. Apply yourself." Tarn leaned back and opened his spike panel and the irising hatch beneath. Only the very tip of him protruded. He would not put in the effort to arouse himself when Pharma was being so contrary.
With a put-upon sigh, the medi-jet leaned over into Tarn's lap and, after only a few seconds of hesitation, put out his tongue and gave the spikehead a lick. More licks followed, covering every bit of the sensitive armor from every angle, and a little more of the spike emerged. After a few more seconds of hesitation, he finally took it in his mouth and began to slowly suck.
Tarn propped his elbow on an armrest and leaned his cheek against his fist. "We're going to be here all night if this is the way you're going to go about it. I have the time, of course, but I imagine that you would like to get back to your clinic before anyone suspects anything."
Pharma glared up at him and began to shift on his knees, back and forth, moving his mouth more energetically across the spike. He paused to suck more concentratedly on the head and used his fingers to massage the ridges and nodes. Tarn purred and continued to extend, growing eager. "Take in more," he commanded, cupping Pharma's chin and drawing him farther down the shaft. He wanted to see the mod activating, and he was not disappointed - with a soft click, the jet's jaw dislocated and the flexmetal of his cheeks stretched so that Tarn's thick girth could fit inside his mouth.
The tank had demanded oral pleasure before, of course, but had been forced to be satisfied with licks, kisses, and strokes due to the physical limitations of his captive's anatomy. At last, he could finally have what he craved. His spike was steadily extending now that it had that hot, wet mouth to welcome it. It bumped up against the intake hatch cover, which quickly retracted before he could express his displeasure at the obstacle. And then - so delicious - he felt the hatch itself separate into several sections and stretch wider so that he could fit down inside Pharma's throat.
The jet's resentment was still clear, but he was displaying no pain or discomfort as he continued to rub at the shaft, coaxing it to push past his lips. The spike continued to slide free of its housing, stretching ever more of its very long, very thick length farther down inside the Autobot. The tank reached down to squeeze Pharma's neck cables gently, gratified to find them bulging around the girth that they contained. How pretty it would have been to have put a collar on his obedient Autobot just to see it straining around the stretching throat... Something to consider for future sessions, of which there would definitely be many.
The spike was so long that, at full extension, it passed the entire length of Pharma's throat and stretched down into his torso, though not so far down as his fuel tanks. Regrettable - Tarn would have liked to feel the open space around his spikehead as he poured his transfluid directly into the fuel mix. He would be satisfied, though, with knowing that Pharma had to put in the effort to swallow him down after he came.
The jet had a difficult time moving freely, what with the stiff rod making his cheeks and neck bulge and fixing his spine in a straight line along its length. He worked nonetheless, pushing and pulling himself up and down the shaft, pleasuring it with his tight heat and flicking tongue. His nose tapped against Tarn's pelvic plating as he swallowed it down as far as he could. Tarn's head lolled and he moaned shamelessly - so few were able to take him like this, and he had had a shortage of potential partners for most of the war. This was pleasure beyond anything that he had experienced for millions of years.
It was good to simply have the feeling of being engulfed so thoroughly, to be swallowed full-length and to feel the mouth and throat flexing around him as Pharma tried to stroke his captor inside of himself. But Tarn felt the need to come rising in him, and he needed all that he was being given, only faster— "More," he demanded, and Pharma tried to pick up the pace and clench his body harder around the shaft, but it wasn't enough. Tarn reached down and cupped his cheeks so he could push and pull at his preferred speed. Pharma gave a strangled noise of protest as he struggled to move fast enough to keep up, but Tarn was fully committed to simply dragging him by the face if he failed to work hard enough.
And oh, that was good, that was so good. All of his nodes were being compressed just so, the ring of the stretched intake hatch was a firm delight, the sight of the swollen throat and stretched cheeks on that arrogant Autobot was delicious— And with the mods in place, he could penetrate farther into Pharma's body this way than he could through the jet's valve, which was simply not long enough inside to accept his full length.
He pulled his captive harder against his pelvic plating and ignored the sounds of discomfort as Pharma's nose was bent against it, savoring the pleasure across his entire spike. The pressure was building inside of him as his body gathered itself to climax, and he was determined to empty every last drop from his tanks into his unwilling mate.
The moment came and he roared as he shoved his hips hard against Pharma's face and felt the transfluid bursting out of him in long, thick streams, pouring directly into the depths of the jet's stretched intake tubing. Tarn sighed in relief as the orgasm went on and on while he focused on squeezing his fluid tank inside of himself, powerfully forcing every spurt through his spikehole, rapturous in his coupling with his Autobot's face as he thoroughly seeded his victim's fuel tanks. Eventually, the spurts became shorter and slower and finally were reduced to only the last drops trickling out of him and down the tubing.
Tarn was utterly breathless, ravaged by the pleasure that he had not had in so long. He remained for some time as he was, the Autobot's swelled cheeks cradled in his hands, the full stretch of his spike buried deep inside the jet's body. Pharma made a questioning noise and Tarn opened his eyes to see the Autobot glaring up at him with his typical sour expression. He wanted to pull off. Tarn pushed at his cheeks and Pharma gathered himself to drag his whole body back and away, but then the tank pulled him back in. And slowly pushed him away. And pulled him back in. Pharma made an exasperated sound.
"I've decided that I want you to smile," Tarn informed him. "I want you to act like you want this, like you enjoy this. And until you do..." He smiled down at his Autobot in joyful anticipation. "...I will be good for many, many rounds to come."