The wash barracks were one of the few peaceful places on the Nemesis. Using the heat from the engines and the various cleaning oils they had in stock created using the Energon crystals that no longer had their substance, it was manned by a crew of Vehicons and always ready for use. Certain sections had specific types of oil used depending on how fast a bot wanted to be and what oil type they preferred in general.

Piston knew what most of the commanders liked and had a private commlink specifically so they could call in advance for anything they wanted to set up prior to their arrival out of the norm or just to notify him they were on their way. But there was one commander he had no clue what to do with.

Predaking sensed the steam in the air and looked around for anything he could use. His abnormal size meant a simple shower was not possible which even Megatron had difficulty using so that said something.

Piston watched the mech grow confused and a bit outcasted by not knowing the fundamentals of the wash barracks. He could tell the Predacon was dissuaded from the difference of species. He thought about what he could do for the other until he remembered the large pools they had. Normally, no one ever used it aside from Megatron and a few others who just wanted to relax. It wasn't technically made for direct bathing like the in-floor tubs were, but it could fit Predaking no problem.

"I think I can help you. Follow me," he said politely.

Seeing Predaking give a small smile was just what he liked to see. He activated the private pool and noticed the larger mech watched with interest as the oil sloshed about. As it filled up, Piston immediately inquired, "Would you like any specific oils mixed in? Scented, shine, rust protectant..."

Predaking frowned, "I do not know. What do you suggest?"

"My opinion, I'd say a little bit of everything. Rust protectant is always good, oils for shine really bring out a glossier color scheme, and there are many more that can do anything you can think of."

"Okay then, I'll take all of it."

Piston got all the mixtures he needed and kneeled beside the pool using one vial of everything. The oil pool became a rainbow of color as each liquid merged with another. It was always cool to see and one of the highlights in his job. Once everything was set, he ushered Predaking to go in. The Predacon was hesitant but carefully slid into the hot pool, and Piston saw his expression turn from stunned to relaxed in a snap as he sat on one end and leaned against the edge with a loud purr.

When Predaking closed his optics content, Piston merely said, "Let me know if you need anything else."

"Aren't you coming in too?"

The Vehicon paused and looked at Predaking who was equally as stumped as he was.

"Wha...well, no, I got to work. It's my job to maintain the wash barracks and keep it always stocked. Love to but I don't have time."

Predaking grew disappointed again before raising an eyebrow. "You could say that you were helping me clean up. Would that not give you an excuse to join me since half of me is currently submerged."

Piston thought about it and technically, it was a form of work if he helped someone who didn't know the routine. This was probably Predaking's first bath ever so he wouldn't be in the wrong to cater to him. Shrugging, Piston approached the oil and peered down in it unsure. This time it was Predaking's turn to be kind.

"It's okay, allow me."

He didn't really have a choice when Predaking reached over and grabbed him, lowering him into the oil to sit beside the mech. Piston did, however, feel comfortable next to the Predacon who only smiled now that they were together. All Predaking wanted was companionship, and Piston was beginning to believe he wanted that too. Sitting there relaxing in the mixture of various scents and other oils was the experience Piston never thought he would ever need.

"You still look stressed from your posture," Predaking said. "You deserve this. Here, I'll help you relax."

Piston had no clue what the Predacon was going to do when he was suddenly placed on Predaking's lap with his back against the broad chest. The awkwardness of how his legs barely could be sprawled across Predaking's emphasized the larger stature of the mech, and Piston blushed profusely as he felt his aft against the mech's panel. He heard Predacon purring as he placed his chin on top of the Vehicon's.

Piston was at a loss of what to do in the situation. Experimentally, he shifted but paused when the purring stopped.

"Are you not comfortable?"

Piston merely muttered, "I am. It's just that I'm trying to get a better position on your...um..."

Predaking smirked and moved, causing his interface panel to rub against the aft of the smaller bot. "A better position you say? I can help with that."

The Vehicon made a weak noise that he couldn't stop and heard Predaking's purring in return when he was grabbed by the waist and grinded against. He reached around to paw at Predaking's abdomen to try and steady himself as the gyrations grew more aggressive. Upon instinct, he released his valve paneling, and his timing was perfect.

The armor pressing against him, expanded his folds and dragged across them. The best part? Predaking grew wise to his shamelessness instantly. Suddenly, he felt a large shaft beneath him, his valve sitting on top of it as Predaking growled. Piston knew what he started, and he wasn't chickening out now. Wanting to make Predaking take his treat, Piston grinded against the spike and heard the Predacon choking down a snarl. The oil made them instantly slick, and his stimulated valve adored the deep ridges of the massive member.

Although he couldn't see Predaking's expressions from his place on the mech's lap, he could tell by the sounds and the occasional licks to his helm the Predacon was loving the attention. He rubbed against Predaking faster, waiting desperately for the mech to take him. He got his wish when Predaking forced him still and leaned him forward with a single servo while using the other to grab the hard spike. Piston gripped the mech's thighs in anticipation.

"Do you know why I'm called a king?" Predaking rumbled in a deadly tone.

Piston merely quipped back, "Show me."

A part of the Vehicon kind of regretted the choice of words when the large appendage eased into him. He quivered at the overstimulation, but Predaking paused midway to let him adjust.

"Y-you're big! Oh Primus, you are-"

Predaking chuckled, "Feels good, doesn't it? Now, you said you had to go back to work? Well, servicing me is a portion of that, right?"

As Predaking leaned back propping his elbows up on the pool edge, Piston knew what he wanted and truth be told, he was right. Piston never thought of his job that way before but whatever satisfied those he catered to...

He sank onto the large spike with a sigh, still reveling in the girth stretching him. Slowly, he rose and took in more of it inside him back down again. He heard Predaking make an unusual noise, a positive one, and used his arms to steady himself upon moving. Oil was being forced within each time he went down on the Predacon making him gasp. Peering back, Piston saw Predaking had his optics closed still purring.

When they opened to see him staring, the Predacon smiled and stroked the smaller mech's backside. "You're doing excellent. Serve your king."

As if he would say no. Piston started getting rougher, bouncing his aft down to take the spike to the hilt. The sensation of being full of oil and the spike made him moan loudly. His movements were even causing the pool to splash against the sides. He readjusted to lean back for a better angle and forced himself to impale the spike like his life depended on it.

"Ah, damn!"

Predaking growled possessively and when he started to match Piston's movements, he nearly had the Vehicon screaming for everyone in the rest of the wash barracks to hear. Piston put his servo to his valve to play with his anterior node as his overload came. He bucked against the intrusion as he felt Predaking empty himself inside his gestation chamber.

The feeling of carrying the Predacon's transfluid made him rub his abdomen, enjoying the abnormal sensations within as Predaking exited him. But then he turned to face the mech and clung to the servos holding his waist.

"Anything else you need, my Liege?" Piston said in desperation.

Predaking grinned, "I want to see you filled to the brim with my essence. Think you can do that for me?"

"Yes, sir," the Vehicon moaned, positioning himself over the spike again.

He made sure Predaking was watching as he nearly ripped his valve with a fast movement. The view the Predacon had of him shaking and forcing himself down again had to be the best sight ever for he heard no complaints from his king and certainly knew the purring of the mech was a good indicator his services were up to par.

"I do hope you will be prepared for me each time I come in here," Predaking said lustfully. "I think your best line of work is here bending to my mercy."

As Piston took Predaking to the hilt and started to grind down chasing the pleasant way clusters of nodes within reacted to the intrusion, he breathed out, "I live to serve."

Piston wouldn't care if this was his only job in the world, he loved it. And he would always be around to service the king of the Predacons. That he promised.


AN: Bath sex. I know you all would want at least one of these one-shots to be in the wash barracks. Here you go! A pairing fit for a king to read.