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"Oh that's incredible."
Hayato sucked in a breath as Hongo's finger brushed against a sensor in his chest.
"Sorry." Hongo pulled his hand away. "Did that hurt?"
Hayato shook his head and smiled as causally as he could. "No pain. But I've never let someone else touch that part of me before. It doesn't feel like anything when I do it. It must have a way of telling internal vs external stimulation."
"Fascinating." Hongo's eyes danced and he turned his focus back to the exposed machinery in Hayato's chest.
It wasn't the first time Hayato had shown someone his insides. It was the second. Taki was willing to help with repairs, but he always turned pale at the sight of Hayato's inner workings. It wasn't the robotics that was the problem, Taki stressed, he wasn't interested in seeing anyone's insides mechanical or not.
"Did you add this part yourself?" Hongo asked. He had no hangups about seeing Hayato's insides. The sight of Hayato's chest broken open fascinated him instead of disgusting him. He was excited to be on his knees in front of Hayato, hands roaming around the mechanisms keeping Hayato alive.
Hayato looked down as Hongo pressed on something. There was a click and Hayato's leg jerked involuntarily, kneeing Hongo in the ribs.
"Didn't add," Hayato said as Hongo winced, "Just moved."
"I'll take that as a warning to be more careful." Hongo pressed his hand to his ribs with a rueful grin. "Anything else I should avoid for my own safety?"
"Watch out for the self destruct button under my heart," Hayato replied.
Hongo's eyes widened.
"I'm joking." Hayato rolled his eyes. "I'm not that stupid."
Alarm faded to affection as Hongo rolled his eyes in return. He ran his fingers over the pump in the middle of Hayato's chest gently. "Your heart," he said softly, "You still call it that?"
"It keeps the blood I got left flowing," Hayato said. His pulse quickened as Hongo's delicate fingers explored the machinery.
Hongo's smiled. He could see the pump changing speed. The realization only made Hayato's heart beat faster and heat flood his face.
"Really incredible," Hongo said, shifting closer.
Hayato's heart was working overtime as Hongo wrapped both hands around it. Hayato could feel the warmth of his palms against the metal as Hongo's fingers poked at something behind the organ.
"Do you know what the circuit back here does?" Hongo asked.
"Nope," Hayato said as heat flooded his face, "I couldn't get a good look."
"I can't either." Hongo squinted, craning his neck as his fingers mapped the spot delicately.
The unfamiliar sensation made Hayato squirm.
"Am I hurting you?" Hongo asked. He stopped poking around, palms resting on Hayato's heart as it thundered away.
"No." Hayato forced himself to stay still. "When I started making modifications I went into the nerve center and changed things around until the pain went away."
"Isn't that dangerous? Pain is your body sending a message something's wrong."
"I don't feel nothing," Hayato said, "I can still feel you touching everything in there, it's just not pain."
"How does it feel?" Hongo ran his thumb across Hayato's heart.
A shudder ran through Hayato's body. He couldn't say if it the touch itself was pleasant or unpleasant, but the way Hongo looked at him made him feel hot.
"Neutral," Hayato said, looking away, "Mostly feels strange. My brain knows I'm not supposed to be feeling things inside my chest, so it gets my attention."
Hongo hummed thoughtfully. Leaning in, he gave Hayato a kiss on the cheek.
"Now what's that for?” Hayato bit down the giddy jolt in his chest and put on a cocky smile, only to be greeted with an equally confident grin from Hongo.
"You can't play cool when I can feel your heart jump," Hongo said, his mouth moving from Hayato's cheek to his lips.
"You're a tricky one, aren't you?" Hayato chuckled against Hongo's mouth. He'd thought their mental connection had laid his feelings bare, but his heart was beating fast against Hongo's hand was even harder to control.
"Sorry, I'll move on." Hongo smiled, kissing Hayato just a little longer before removing his hands.
He moved lower to a panel of knobs and switches.
"That I added," Hayato said.
"Really?" Hongo lit up. "What do they all do?"
"This adjusts the resistance in my joints," Hayato explained, "Less resistance increases speed and flexibility, more increases strength."
"That makes sense," Hongo's eyes danced as he examined the panel, "What about the others?"
"This goes to my eyes, this to my ears. I can dial them up or down. Hasn't been as useful as I wanted. If it turn up my hearing then I can hear everything. There's no way to filter out the useless sounds."
"What about this one?" Hongo nudged the last nob on the panel.
Hayato sucked in a breath. He'd known it would come to this question when he accepted the offer to let Hongo explore his alterations.
"It does the same thing but with all my nerves."
Hongo’s gaze darted up and a smile spread over his face. “Have you tried it?” he asked, almost innocently. Almost.
“I turn it down when doing repairs.” Hayato shifted nervously. He’d wanted to bring this up at some point. Now that it was brought up, it felt too embarrassing.
“Have you tried the other way?” Undeterred by Hayato’s avoidance, Hongo pressed on with the questions.
“A little.” Hayato tensed as Hongo’s finger brushed the dial.
“Did it work, as intended?” There was a weight on the last two words. Not saying it exactly, Hongo wasn’t the type to be vulgar, but he was fast losing his blustering shyness. The rise in confidence was a blessing and a curse, Hayato realized. There was no way he’d be able to flirt his way out of this one. Which was good because he didn’t want to.
“I think so,” Hayato answered after a long pause. “But it’s hard with this sort of thing. I could only test the sensation of me touching myself and that’s always different than external stimuli.”
“I can provide external stimuli,” Hongo said without missing a beat.
“Oh, do it already,” Hayato said, bracing himself in his chair, “You're itching to see me squirm, aren’t you?”
Hongo nodded as he turned the dial slowly, stopping when it clicked after a fraction of a turn. He looked up at Hayato. “What’s the scale here?”
“1-10, fives the default and now I’m at a six,” Hayato said. His skin buzzed and he was suddenly very aware of the weight and texture of his clothes, but it wasn’t too much yet.
When Hongo’s lips crashed into his, he could feel the difference. His breath hitched as Hongo deepened the kiss. It wasn’t unlike a nice buzz. His body felt pleasantly fuzzy and every touch shot through him more than normal. But he wasn’t so dainty as to be falling apart at such a low setting.
Hongo must have sensed that because there was another click. Seven. This was where things would get interesting.
The faintest brush of fingers along his neck made him shiver and a hand on his thigh made heat rise in his chest.
“Oh, that’s fascinating,” Hongo whispered.
“Huh?” Hayato’s eyes squeezed shut and his body trembled as Hongo squeezes his thigh.
“The way your heart pumps blood when your pulse is going this fast,” Hongo said, “I knew that’s how hearts work, but I’ve never seen it in action before.”
Hayato didn’t ask what he was seeing. There was a growing need prickling under his skin. He'd lose his mind if Hongo went off on a tangent about his circulatory system instead of touching him more.
Hongo's hand left his thigh and Hayato whined before he felt the dial shift until there's another click. Eight. He hadn't pushed it this far before.
His skin tingled everywhere his clothes touch and burned everywhere Hongo touched. The touches were gentle and curious, he could tell that much, but even the softest brush of hands over his cheeks and thighs took up all his thoughts and he whined for more.
Reaching out, Hayato grabbed Hongo's wrist. He could feel every detail under his fingertips. The heat of skin, the pulse racing under Hongo's skin, the scattering of scars, some that he'd never noticed before that are scattered over the back of his hand.
Hongo lifted Hayato's hand to his mouth and kissing the knuckles. Hayato bit back a moan at the simple act. Every nerve was burning, on full alert, telling his every detail of Hongo's lips and how soft they were as they brush over his skin, and his hand with the details of every callous and every line colliding in his thoughts all at once.
Hongo, noticing his reaction, squeezed his hand before turning it over and kissing his palm. Hayato closed his eyes and sucked in a breath as Hongo’s lips moved over his palm, pressing soft gentle kisses along Hayato’s horridly sensitive skin. His fingers rubbed the back of Hayato’s hand as his mouth moved up and down each of Hayato’s fingers individually.
Hayato kept his eyes closed, head tilting back as the sensation washed over him in huge uncontrollable waves. The touches were overwhelming, making him shake and whine.
Hongo chuckled, his breath hot against Hayato‘s hand. “I'd like to do more, but I'm not sure if you'd be able to handle it."
Hayato's thoughts were muddled, but he still had enough of himself to open their mental connection.
He opened his eyes just in time to see Hongo's eyes go wide the moment their minds met.
"Oh," Hongo whispered reverently.
Hayato felt the shock coursing trough Hongo's mind. He felt his own intense pleasure mirrored back at him with surprise and wonder. And he felt the desire that gripped Hongo to do more, push more, make him fall apart.
As if Hayato wasn't already falling apart.
Letting his legs fall open, Hayato closed his eyes. The darkness helped him collect his thoughts. A thousand sensations washed over him as Hongo popped the button of his pants. The cool air on the exposed metal in his chest contrasted with the steady warmth of Hongo's hands as he freed Hayato's cock. He could feel the thundering of his own pulse against Hongo's hand as the man stroked him, each movement long and languid.
Head falling back, Hayato jerked into Hongo's hand. His mouth hung open, short rough breaths ripping through him as pushed for more.
A wash of hot air ghosted over his cock. The only warning before the warmth of Hongo's hands was replaced by the heat of his mouth. The air left Hayato's lungs and a half formed thought about whether Hongo could see the movement in his lungs before it disintegrated and all he could think about was Hongo's mouth.
Every slow movement dragged him farther away from sanity. His heightened senses picked up every detail of the uneven press Hongo's tongue, the drag of lips along his shaft, every shaky breath Hongo let out.
A moan ripped from Hayato's throat, quickly echoed by a moan from Hongo. The vibration made Hayato arch. His eyes flew open as his hand fisted in Hongo's hair. He'd thought he couldn't get anymore worked up, but the sight of Hongo's eyes, dark and focus, boring into him as the man ran his tongue up the length of Hayato's shaft, pushed him even further.
His warning came out as a strangled cry. Instead of backing off, Hongo kept his mouth on Hayato, chuckling as Hayato tried and failed to stay still as he came. His vision went white. He could feel every drop of sweat forming on his skin and the drag of fabric on skin as he jerked helplessly. Hongo held his hips still as he rode it out, his breathing just as uneven as Hayato's.
As the orgasm faded, Hongo ran a finger over the dial.
"Done?" he asked. His other hand ghosted over Hayato's oversensitive cock.
"Yeah," Hayato squirmed and Hongo laughed.
The dial turned, clicking once. Sensations faded, feeling practically dull compared to the past few minutes.
Another click and it they dulled more. Hayato let out a breath as the final click returned him to his default state.
"Enjoy yourself?" he asked, nudging Hongo with his knee.
Hongo stood, straightening his clothes. His head dipped, the flush across his cheek still visible as he rubbed the back of his neck. "You know the answer to that question," he said, a goofy grin spreading over his face.
Leaning back in the chair, Hayato took a long breath. He eyed the bulge in Hongo's pants before slowly raising his eyes to watch Hongo's embarrassed expression. "I do," he said, all too aware that the visible beating of his heart contradicted the cool tone of his voice, "Maybe I should rewire that panel, make it easier to access without having to open everything up."
"Yes!" Hongo said a little overenthusiastically, "I mean, good idea. I can help with the modification."
"Another time." Hayato grinned up at the blustering man. "Help close me up. I can't be hanging open for what I'm about to do to you."