Part Swap

It was late on the Tempest when Zedna finally finished up kitchen duty. He figured it likely he was the only one left up aside from whoever was on watch on deck, so he didn't give walking into the bath without knocking a second thought.

To his surprise, he was not met with an empty bath, but Koriyu's scandalized scowl as he rushed to cover himself. "Zedna what the fuck?!" He hissed.

The blonde gave a small shrug and put his hands up apologetically, "whoa, sorry Kor, thought lights out was a while ago..."

His eyes caught the unusual roundness of the captain's poorly hidden chest and perked excitedly, "hey, nice bits! Are they custom?"

Koriyu's brow furrowed deeper, "what?!"

"That chest piece, did Shoyu make em for ya?" Zedna pressed with enthusiasm.

"They're mine and I hate them." Koriyu answered in his blunt monotone. This conversation had already gone on too long and a statement like that was meant to be a killer blow...

But the boy merely blinked from where he stood in the doorway as the dots connected. That wasn't custom or a fun spare, that was Koriyu's only chest piece, the bandages it was normally wrapped in weren't to repair damage...they were for binding.

"Oh."

He beamed.

"You want different parts? You know we c'n interchange em, right? Well...at least th' modern Numbers..."

"What are you talking about?"

"Like this..."

Koriyu watched as his fellow cyborg casually shoved a hand into his own pants, something inside made a small popping sound, and then he pulled it back out, opening his hand to produce...with no ounce of modesty...what had to be his own cock and balls.

Zedna grinned as he saw the gears turning in Koriyu's head as he stared, "wanna swap some parts with me?"

"Shut up.Get in here.Close the door."

Koriyu let his guard down a little as Zedna happily followed the orders. "You're awfully okay with this..." he probed.

"Huh? With what?" Zedna breezily began undressing.

Koriyu pouted harshly, not knowing if he should look away. He ended up averting his eyes by letting them drop down onto his own disappointing form, "you know....the truth about me."

"Yer already livin your truth, bro. Our bodies don't determine who or what we are, they're just what we get around in." Zedna gently encouraged, then laughed, "I guess that goes double for rogue science experiments like us, huh? Anyway, yer doin what ya can t' be happy in yours, I see ya. Here, d'you know how to release em?"

He moved closer to help Koriyu, who relaxed and lowered a previously hastily snatched up towel from over his chest to around his torso. Zedna understood him more than he thought, maybe he didn't have to hide so much. The mechanism was a little different, chalked up to the difference in when they were built. With just a little effort, Koriyu's chest piece released with a small pop of steam and a strangely satisfying spasm.

With a little more effort, Zedna fit his own chest piece onto Koriyu and tested the remaining breasts on himself. Looking up from them, he watched the captain marvel at the flat pecks.

"How does it feel, Kor?"

"I..." Koriyu's head swiveled in search of something to see himself in. He turned to catch his reflection in the little mirror above the sink, standing in profile within it. He stared silently, star struck, and ran his hands over his chest a few times, a small smile started to crack his usual stoney expression. "It feels...right." He then turned to look at the other cyborg, "Zedna, thank you."

When he looked back, the blonde was striking a provocative pose, the b cups on full display. "Hey, any time if I get t' look this hot too~!"

Koriyu frowned, flustered. They were nice to look at when they belonged to someone else.

Zedna smiled wider, gesturing to where he'd left his genitals at the side of the tub while undressing after his initial demonstration. "Wanna try my junk on, too?"

After a quick wash, which Koriyu insisted on, they swapped lower equipment.

They took turns looking in the mirror, down at themselves, and at each other.

"Kinda heavy." Koriyu commented bluntly, eyeing the new undercarriage while testing fighting stances. His words were harsh but there was a note of pleasant eagerness in his tone...like someone excited to try out a gift they'd just received.

Zedna got comfy on the edge of the tub and giggled to himself watching his brother in steel acclimate to the parts he was trying on. "Wull it'd be packed in a cup er at least underwear if you were fightin," he offered casually. "How does it feel?"

"Different." Koriyu answered, then continued after some thought, "in a good way." He then raised his glance up to Zedna. "What about you? Doesn't that feel weird? Don't you want your parts back?"

Zedna gave him a wide sunny smile in response, "Nah, it's cool! I like any parts."

"Any parts?"

"Yup!" He made a point of looking over Koriyu in an obvious way, and offered playfully, "Damn, Kor, yer a real stud, huh?"

Koriyu tensed, then stole another glance at himself in the mirror. "...yeah." He answered, biting back a grin without thinking.

There were suddenly arms draped around his neck as Zedna closed in for a hug from behind and craned down a bit, another bright grin for him in their reflections. He let his rigidness melt away, relaxing in the oddness...no, the realness they were sharing. Like another he had loved, Zedna was turning out to be someone he could really be himself around.

Then he felt them. The soft squish of tender flesh against his back. His face flushed in the mirror and his shoulders tensed again.

"Z-Zedna."

"Huh? What's up?"

"Your...uh, b-boobs. They're touching."

"Huh? Oh." Zedna let go slightly to look down, he was pressing his boobs against Koriyu's back as a result of the hug, he grinned again catching sight of something further down and leaned back in, pressing even more and pointing to direct Koriyu's attention, "yeah, Kor, an' it looks like y'like it~"

Following the pointing finger lead Koriyu's eyes to the half erection between his legs. All he could respond with was a short little exhale of steam. It was more than he'd ever let himself imagine, and somehow looking at it made all the feeling flood into his awareness. He watched it twitch, a stronger sensation in response to feeling the first.

"Well? Yer th' captain, what d'ya wanna do?" Zedna asked playfully.

At his shorter stature, it was easy for Koriyu to turn and slide an arm around Zedna's lower back. It brought them side to side at an angle instead of back to front. Before he put another hand on him, he replied while looking him in the eye, "I want to touch you."

Something about how careful yet direct he was made Zedna blush excitedly. "Do it, bro."

Without any further hesitation, Koriyu pulled Zedna closer until his hip was pressing into his side and ran the other hand up his torso and over one of the newly installed breasts. He let out a gasp at the attention, not bothering to try and hide or downplay his enjoyment.

Koriyu let out a heavy breath as arousal tugged at his loins again. He closed in on Zedna's chest wordlessly, pressing his mouth against the unfondled breast...their height difference putting it in perfect range.

Soft moans and giggles poured out of Zedna, everywhere Koriyu touched felt so good. His hand ran over his chest in a way that exaggerated its roundness and his fingertips teased the hardening nipple. On the other side, his lips and tongue explored the body part eagerly.

Holding Zedna's hips close with his other arm, it wasn't long until both cyborgs were aware of how hot they were getting below. Koriyu's cock was practically burning a hole against the inside of Zedna's thigh, he was salivating at the thought of it. Before he could try and suggest taking things further he found himself being nudged backwards further and further until he was sitting on the closed toilet.

Like a wave washing over him, he looked up to see Koriyu leaning over him and their lips locked. The kisses were fast and hungry, both men immediately devolving into passionately tasting each other.

With their foreheads resting on each other, Koriyu pulled away to speak, a little string of saliva stretching between their lips as they parted. "Zedna," he whispered in a hot breath, unsure whether to put his hands back all over Zedna or finally address the demanding throb of his member, "I want more than touching, is that okay?"

It seemed Koriyu loved just as intensely as he fought, and somehow Zedna was fine with surrendering this time. "Do whatever you want to me, Koriyu."

Koriyu inhaled sharply, that was all the permission he needed.

"No." He said bluntly, cupping Zedna's chin and holding eye contact, "keep calling me captain."

A crooked, flustered grin curled one side of Zedna's mouth as he held the 600's gaze, this was better than he ever could have predicted. "Aye, Captain ❤️"

The way Zedna kept playing along happily made it so easy to keep going further. Koriyu released his chin and ruffled his hair, "good..."

Such small praise shouldn't have light Zedna up that much, but he wasn't going to question it.

Then he felt Koriyu's hand grip the back of his head and pull it toward him at a downward angle "...You're going to start by sucking my cock." He ordered.

Hell yes.

Zedna slipped off his seat and onto his knees, eager to give his captain unforgettable service. Koriyu had been so focused on Zedna's body that he hadn't even tried to touch himself yet. The blonde's soft lips were the first thing he ever felt on his member, aside from the cold air. His whole body shuddered. Zedna's lips parted as they slid over the head and down the shaft slowly, letting every inch be its own whole experience.

His mouth was hot and wet, the slowness he was taking the full length at was maddening, Koriyu's piece strained and throbbed against Zedna's tongue until the mounting desire finally hit it's limits as the two connected down to the base.

"Fuuuuck."

A deep, guttural sigh escaped the captain as his fingers curled into Zedna's hair. His head was swimming in endorphins from the course of the whole night from joy to pleasure. A moment of hesitation quickly washed away as the playful young man's words repeated in his mind 'do whatever you want to me.' Well. He'd gotten in the ring, it would be rude to go easy on him.

Zedna was pulling back, again taking his time. Enjoying himself as much as he wanted to drive Koriyu crazy. Every throb and sigh sent ripples of carnal glee through him, the blooming heat and arousal of the part between his legs felt like it was melting...there had only been one other who had been so generous with positive feedback before, but this was different. Koriyu was safe to play with like this.

He paused for dramatic effect as his lips drew back over the head of Koriyu's cock, the forceful yank back down to the base was a pleasant surprise that produced a muffled moan that was silenced abruptly by the back of his throat filling with the piece.

Zedna's jaw yielded as it took a few gluttonous thrusts for Koriyu to find his rhythm. The air in the bath filled with soft lustful grunts and the wet sound of Zedna's face getting fucked. Naturally, that lead to his next order. Koriyu hissed through heavy panting, "keep moaning for me, harlot."

Zedna complied immediately, enthusiastically making the noises his captain wanted to hear.

"Louder." He commanded, sliding a foot over the floor and pressing it into the hot mess of Zedna's pussy.

Zedna's volume spiked satisfyingly at the sudden attention and then choked on the cock in his throat, the watering of his mouth spilling out over his bottom lip. He put his hands on Koriyu's hips and leaned back against the hand still gripping his hair, needing to gasp for air.

Koriyu allowed it, if only to see the look of overwhelm on the blonde's face and the sloppy splash of drool as his mouth was freed. A small wry smirk tugged his lips as he stirred Zedna up more, savoring the way his expression twisted in pleasure.

"Ah~ C-captaain!" Zedna cooed, only able to look up at him with one eye open.

Koriyu heaved a long centering sigh, still toying with Zedna's pussy and drawing mewl after mewl from him. "You really are a pretty harlot. Offering to cook for passage and then giving head this good for free?" Koriyu asked bluntly. More delicious praise. "And look at you, so happy to be made a mess of."

"I c'n be more of a mess fer you, Captain~" Zedna replied, making the kind of face that was meant to be cum all over.

Koriyu shuddered with temptation. "No."

"...No?" Zedna repeated, intentionally making his tone desperate, anticipating being made to beg next.

"On your feet.Turn around."

Zedna obeyed happily, he turned his back on Koriyu as ordered and was immediately bent over, forcefully and quite far to accommodate for the captain's height. His knees went weak as he felt the entrance to his pussy teased, the tip of Koriyu's cock circling it. His molten insides ached and tugged, wanting it so badly.

Koriyu could feel the heat coming off of Zedna, it was almost drawing him in. When Zedna shifted impatiently to try and help line the parts up, Koriyu pulled away, "you want it?"

"Pleeease, Captain~"

"Good. Beg harder for me."

Despite having been prepared to do his very best begging performance just moments before, the real insatiable need Koriyu had teased out of his body caught him off guard. Pleading gibberish dripped from him on command and his hips shook invitingly along with each word. "Please, Captain~! I'm goin insane~ I need you t' fuck me raw~ I'll do anything for yer cock~!"

"Anything?" Koriyu asked, pressing his shaft against Zedna's gooey slit, teasing him further.

A fresh trickle of drool spilled from one corner of Zedna's mouth, he really was going insane. "Anything! Please!!"

"Good." Koriyu finally slid inside with the same slow control Zedna had demonstrated with his mouth. A long elated cry came out of the blonde, both volume and pitch rising the deeper Koriyu's cock buried into him.

Time stopped for a moment as they soaked in their own sensations. Koriyu's hands gripped Zenda's hips, his fingertips pressing down hard into the soft flesh. He continued to hold still, holding his breath, as if this were a fragile dream he had to be careful to stay in. "Tell me you like it." He ordered quietly.

They hadn't even begun moving yet and Zedna was out of breath. His whole body wrapped around the hot thick cock, all the aching and pulling his insides had been doing were instantly satisfied and hungry again. "Caaaptain..." he breathed, "I loooove it~! Fuck me, pleeeease!" He backed himself further against Koriyu's hips desperately.

"Good." Koriyu held Zedna's hips tightly against his and then began to move, quickly finding the same unrelenting rhythm as before. He didn't have to give another order for noise, Zedna was punctuating every thrust with love-drunk moans and sweet nothings.

It was incredible, his mouth had been nothing compared to the intense heat and lasting, somewhat slimy, wetness of his pussy. The walls squeezed and gripped his cock from every side, the only reason to pull out being to shove it right back in and repeat the sensation again and again. Koriyu could feel a pressure rising in his loins, thrusting harder and faster into Zedna as he chased it.

Zedna's brains were melting out of his ears, completely surrendering to his captain's will. Juices leaked down his thighs. Each thrust rocked his depths with a stronger pleasure than the last, and a crescendo was beginning to build inside him.

Koriyu growled over Zedna's moans and the slapping of their bodies, "Of course you'll do anything for me, I'm the fucking captain. I give the orders and I get first claim, harlot. The rest of the boys can have whatever you want to give them except this," he slammed into Zedna's pussy with the full extent of his cyborg strength for emphasis, "this hole is mine, understand? No one fucks your sweet cunt but me!"

Zedna simply devolved into repeating "yes, Captain! ❤️❤️" until a few more heavy slams put them both over the edge and they both moaned loudly. The release of his orgasm washed over Koriyu's cock, he felt it strain hard inside him and then fill him to the brim with hot cum.

The two spent cyborgs remained connected for a moment, panting in pleasant exhaustion together. Zedna was aglow with how well he'd pleased his captain and how much praise he'd gotten for his work.

They slowly came untangled and Koriyu's tone and touch immediately softened. He had left character. He rubbed Zedna's back gently and helped him up, "how was that? You ok?"

"H'yeah!" Zedna gushed, wiping his mouth, "that was sooo good! Yer already usin' that thing like a prooo--?!?"

His feet suddenly left the floor as Koriyu picked him up and carried him princess style toward the door.

"Huh? Where are we goin, Kor?" he asked in confusion.

"To my cabin." Koriyu answered bluntly. "That was just round one."