Note: Filling a prompt: Ratchet has a hands fetish. It's all Ratchet/Bee in this intro chapter, but the story is Ratchet/Optimus in coming chapters.

Bumblebee sat astride Ratchet, taking his finger deep in his mouth. Ratchet grunted and bucked up against the smaller bot's aft, eliciting a moan. Even with his spike rubbing against the little bot, the medic's mind was totally focused on his finger as Bee pulled it in and out of his mouth. What could he say? Medics had sensitive hands.

The door suddenly opened and light flooded into the storage room. Bee and Ratchet jumped with surprise as Optimus Prime looked down at them. They stumbled and shifted around, trying to make the scene a little less explicit to their leader's eyes. But the blue and red bot looked down at them with as much interest as he did when Sparkplug bent over and split his pants.

"Sorry Optimus," Ratchet said with chagrin. Bee apologized similarly.

But by then Optimus was looking up at a shelf, his posture as straight and formal as usual. "It's no problem. I'm just looking for a spare part for Ironhide. Let's see…"

Ratchet and Bee sat frozen, not quite in their previous position and not really separated either. It wasn't the first time Optimus had walked in on a pair of bots interfacing around the base, and some of those times Ratchet was involved. He should have been used to it, but Ratchet was mortified now for being caught by his friend with the youngest of the autobots.

Optimus Prime ran his finger up and down the front of his faceplate as he scanned the shelves. Ratchet watched Optimus' fingers glide up and down over the metal, suddenly fantasizing that it was his own fingers pressing against Optimus' faceplate. He knew it was wrong to fantasize about his friend that way, but hand stimulation just drove him wild. It was a rare sight to see his leader with his faceplate pulled back, and so it made the fantasy even greater as he imagined the bot exposing his face and taking his thumb into his mouth.

He was pulled out of the fantasy when Bumblebee elbowed him. He leaned over and whispered for Ratchet to do something. Apparently the young bot was feeling worse than he was. Their leader seemed to be searching for eons.

"What are you looking for?" Ratchet finally asked.

"Hide needs a new cannon shaft. His current shaft is bent and his aim is off. I'm sure you know what a beast that's made him into."

Ratchet chuckled and turned to his side, grabbing a box from the shelf behind him. "Right here, Optimus."

"Oh, thank you. I'll be going then. Have a good evening."

The door shut and Bee blew air from his circulation vent. "Primus, I thought he'd never leave! How could he just leave us hanging like that? I thought he'd take forever."

Ratchet frowned. "Well this is the storage room after all. It's not like he barged into one of our personal quarters." He wished he hadn't agreed to Bee's idea to fool around here.

"Whatever," Bumblebee said as he sat back on top of Ratchet. "Let's get this going."

"Sounds good to me." Ratchet circled his thumb around the corner of Bee's mouth, but he moved his head away.

"Enough with the fingers," Bee said with exasperation. He was obviously stressed from being caught in the act. "I just want to get on with this."

Ratchet sighed, knowing his hands weren't getting anymore loving tonight. "Actually I think I'm just going to go. That interruption ruined the mood and I'm not feeling like it anymore." He grinned at the little bot. "It was definitely getting good though."

Bee pouted. "Well promise we'll take a rain check. Everyone says you're a stud when you're in the mood."

Ratchet resisted telling him he could get back in the mood if Bee would just play with his damn hands a little longer. It was a shame no one had the patience to satiate his little kink.

"I hate being the only one who hasn't had a piece of you," Bee continued, "I mean, except Optimus Prime of course." He laughed. "I don't think anyone has the wheels to put their hands on him."

Ratchet grinned and patted Bee on the aft, but Bee had reminded him of Optimus. Now he couldn't stop thinking about getting his hands under that faceplate.

To be continued…

I'll give you a cannon shaft for your thoughts on this.