A Predaking X Sister Reader as suggested by @VictoriaSkylur 

Hope you enjoy!

(Y/D) - Your Designation

(F/C) - First Color

(S/C) - Secondary Color

/~\

     Predaking drug a servo down his faceplate, watching as his sister-in-arms was brought back in cuffs once again. Were they truly related? Who knew, their history was lost eons ago, but he knew not an ounce of romantic liking had ever surfaced, and his spark felt repulsed at the idea- No, and she felt quite the same as the smaller Predacon smiled back with a cocky arrogance. 

         "Hey big bro-" The Decepticon behind her released her cuffed servos, making the mistake of not running immediately afterwards as she pounced on him, chameleon-like, sharpened tale keeping her balanced on her three-toed pedes. She growled when the bigger bot picked her up by her backplates, watching as her prey hurried back into the Nemesis.

         "Must you act so foolishly? Our creator will be most displeased." He refused to put her down as the Predacon femme, known as (Y/D), wiggled in his hold.

         "Oh, he can frag himself, I'm just having some fun!" She twisted around and he finally released her before she could hurt herself, "What's wrong with scaring a few drones and stealing the medic's buffer?"

         "Clearly that's not all you did if they brought you back in cuffs. Again." He rolled his optics upon saying 'again', which made the smaller Predacon's frame twitch.

         "Oh come on- they treat you like royalty! They treat me like scrap, what do you think I was going to do? I'm tired of being looked at as the weaker bot just because I'm a femme! I'm obviously not as weak as they think if I'm the only one who survived the Autobot massacre of our brothers and sisters!" She screamed at him, chassis heaving in her frustration as (Y/D) stomped passed her brother. 

     He sensed her frustration, more so in her Predacon form that resembled a two-helmed lizard, no wings having formed on her back plates as they did on Predaking, so she was flightless. She took up a corner of her cell, she loved to call it 'prison' after learning the human term used to describe a facility that held dangerous felons, horrible fuel, cold quarters and bad company. She hated staying still so Predaking knew his sister was upset if she resorted to just- sulking. 

     The bigger beast sat beside her, despite her show of aggression of flattening her knife-like, curled tail, barely hovering above the ground and stiff. Predaking sighed, shaking his helm as he called her bluff, setting a servo on her back plates. 

         "I'm sorry you were the only one to survive the blast," he watched her (F/C) optics glance away from him, the color clashing with her (S/C) armor, "I'm also sorry the Decepticons treat you as lower then them. You are deserving of far better as a Predacon. But my dear sister, this sulking is unbecoming and immature. Rebelling as you have been also will get you nowhere."

He waited a moment, hoping for a reaction, but she continued to look away with both her beastly helms, showing she truly had no interest in listening. If she did, at least one would glance back at him. Seeing that speaking to her was a lost cause, Predaking left (Y/D) to her own devices. A rather grave mistake-

         "Three weeks and you still can't find her signal!" Predaking roared at the three Decepticons in front of him, Starscream quivering, Megatron exasperated and Soundwave as unflinching as ever.

         "We assume (Y/D) is offline," Megatron said coolly, in truth not knowing where she was at all- she had simply vanished off the Nemesis without a trace. Usually she'd get cocky and slip up, having the natural ability to both cloak her signal and render herself invisible to the naked optic, her only fault being her heat signature and occasional snicker. "Soundwave has run a scan over the entire ship more than once, and found nothing which means she somehow activated a ground bridge without his knowledge (an unlikely assumption), or she crept out when we were landed."

         "She wouldn't, she has to great a risk of being caught by the Autobots without the gift of flight!"

         "Perhaps she was pushed to that point." Megatron said without a single drip of emotion in his voice- and it enraged the beast before him.

     Before Predaking could protest Soundwave had an alert appear on his visor. An energon mine had been attacked. They only knew because no one was responding. Megatron ordered for Predaking to follow the drones through the groundbridge, graciously provided by Soundwave. He did so unwillingly but being on the ground might bring him closer to finding (Y/D)- He hoped. 

     He was not in his natural form, so the cramped space of his bot form made him edgy and irritable as he observed the quiet mine. It was smaller, rather insignificant, barely wide or tall enough to let him pass through unhindered. He knew he couldn't fight in here if the occasion arose. His audio stopped listening to his own inner monologue as he heard the laughing of... femmes. With a wave of his servo he told the vehicon warriors behind him to halt, and they did so with a mild nervousness, hating to be so cramped with the behemoth in front of them. 

     Predaking took hesitant steps toward the bigger area that held the last of the energon crystals not yet delivered to the Nemesis. It was difficult to simply peak around a corner with his bulk, but somehow he managed, growling at the sight of the smiling (Y/D) and Autobot femme, Arcee.

         "But he wasn't the bot I was trying to prank, so I found Steve and-" the femme stopped, making Arcee raise an optic brow.

         "Something wrong?" She set the last of the energon in a cart, ready to roll out when her new friend was-

         "Start down the far tunnel and ask for a ground bridge, quickly."

Arcee didn't question (Y/D)'s order and left in the opposite direction of Predaking and the Decepticon troops, leaving only the smaller Predacon to turn and face her brother.

         "Surprise. Miss me?"

         "You would betray your only kin?!" Predaking growled, stepping out from his hiding place with a glare, his sister nonchalant.

         "For the sake of my sanity? Absolutely," her sword-like tail twitched in it's curled state, showing she had no fear, yet no malice towards him either, and it both confused and frustrated the king. "Besides, I feel more at home with the Autobots than I ever did on the Nemesis. That Primus forsaken death vessel!"

         "The Autobots took our brethren away- nearly murdered you! Does this not mean anything?" The cave walls shook at his tone, rocks falling between the bots. For once, (Y/D) seemed at peace then hot helmed toward her brother as she did on the Nemesis. Instead she sighed, shaking her helm as she turned away towards the direction Arcee took.

         "Look, if I told you the truth, you wouldn't believe me, just say they're Autobot lies, and attempt to bring me back. We both know what awaits me there: misery, pain and humiliation. You never heard the whispers in the halls, you couldn't. I did. The Autobots treat me like family, not a freak or a monster."

         "Did I not treat you like family?" Predaking's tone changed from fury to hurt- it was not his intention to treat her like any other but his sister, albeit she was a pain in the rear axel, she was still the only surviving Predacon from that explosion. A miracle. He did not dote on her like a spoiled human child, but he did his best not to push her away. He was surprised when he received a hug.

         "Of course you did," she sighed, "but only one voice of comfort is easily drowned out by the constant negativity on that vessel. Please, come with me! The Autobots are far more than meets the eye."

     Predaking sighed, hugging her back before pushing her away with enough force to make (Y/D) stumble, using her tail as support on the ground.

         "They must earn my trust harder than they have earned yours." his faceplate returned to it's angered scowl. "I suggest you run."

Despite his serious tone, (Y/D) smirked as the ray of hope lightened her spark of his possible change to join the Autobots. They simply needed to gain his trust- 
With a sloppy salute, (Y/D) transformed, running towards Arcee's previous path before turning invisible, a groundbridge soon swallowing up empty space before disappearing, and Predaking was to late to drag his sister back.

/~\

Ah- yes, siblings. Having three myself, I know the struggles. All younger.

Thank you for reading through this slightly sad short story XD