(This is heavily inspired and influenced by the works of @revelboo and @seraphimaa, mainly inspired by Seraphimaa’s Original work: https://www.tumblr.com/seraphimaa/816398213328388096/mtmte-lost-light-human-pet-au )
In this AU, Cybertronians keep organic lifeforms that they deem non-sentient as pets. Early in humankind’s history, Cybertronians came to earth and saw early humans as non-sentient but intelligent creatures, kinda like crows or dogs, and decided to take some back to Cybertron for the organic pet trade. Before entering the pet trade, human’s basic anatomy was studied so that proper nutrients and food could be made as well as basic health care. Originally, humans were seen as creepy by most of Cybertron and only a few avid collectors kept ‘breeding’ pairs or kept small communities of humans to study. After the war however, (in this AU, the war never happened on earth) organic companions started to become popular and when the Avid collectors who had humans, showed off their collections, in which, humans became a hit and quickly became popular.
Rung had been a psychiatrist for some time and had noticed quite a few of his patients had started bringing their bipedal pets with them to their therapy sessions. Some of these bots were less talkative and were closed off, but when they brought their pets, he noticed how it became easier for them to open up about their issues, he saw how these pets seemed to soothe their owners emotionally and he became incredibly curious about them
Rung hadn’t really had a pet before so he did some research on humans after learning what the species was called from his patients. He learned that they needed at least one place on the ground (preferably a closed off space) to relieve themselves of their waste, a soft nest to sleep in, some outer coverings to keep them warm since Cybertronians prefer colder temperatures, basic food and water, as well as specialized soap to clean them with since their skin can absorb harmful chemicals
He also learned about basic human anatomy and how females required specialized sanitary undergarments for their monthly reproductive cycle should they be of a certain age. Although these undergarments are optional, most owners with females prefer to use these undergarments to avoid having to clean multiple messes
Rung had made sure to set up a small habitat for the human he planned on getting, making sure they had a private area where they could relieve themselves, (the toilets basically just have a motion sensor that senses when something is dropped in and vaporizes it after a set amount of time) he also built them a little nest to sleep in that would stay in his berthroom
After ensuring that he was ready to acquire a human, he left to meet a reputable breeder who sold humans. After picking you from the breeder and acquiring the rest of your necessities like food, drinking water, some clothes, a harness and leash (pets must be on leash in public, especially small ones so that they don’t get loose) some enrichment toys as well as bathing supplies, he happily brought you home with him
Since Rung is on the taller side of minibots, you reach about hip height on him. You’re still quite small compared to him but the size difference is part of the human charm. When he first brought you to his home, he took off your harness and let you explore as he kept an eye on you and put your stuff away. Like most Cybertronians, he didn’t think you were sentient, but that would quickly change
After exploring your new home, you walked over to find Rung building another one of his model ships. He watched you walk over to him and since he read that your species was highly curious, he began to show you what he was doing, only to watch you start taking pieces of the model and start putting them together at first he was worried but now he was fascinated. Despite not being able to read the instructions, he watched as you studied the pictures on the instructions and figured out what pieces went where. Rung knew humans were intelligent, but this is truly fascinating. Perhaps you’re able to do this the same way your kind is able to recognize patterns and make tools
After helping you put the model ark together, he smiled and pat your head in praise. Seeing you look up at him kinda unsettled him, seeing such intelligence in your eyes. When it came time for you to eat, he put your food and water in bowls on the floor, excepting you to eat out of them. He watched you look at the bowls on the floor, then up at him, and, wait, did you just roll your eyes at him. No, he must be seeing things. He watched as you carefully picked up the bowl of food and ate the food. He didn’t know how much you normally eat so he put a small amount of food in the bowl. Imagine his shock when after finishing your food, you walked over to him and held out the bowl, before pointing at it repeatedly. Were you trying to imply that the bowl is empty and you want more? You pointed at the bowl and then your mouth and held the bowl towards Rung again. He put a bit more food in your bowl before watching you walk away to sit back down and eat. Strange, you humans have very Cybertronian expressions and gestures
Since Rung didn’t know when you last bathed, and he had read that humans need bathing regularly, about once every couple of cycles, he figured he’d bathe you. He picked you up and brought you to his wash rack and got your supplies ready and was about to remove your coverings only to see that you had already done so and had set your coverings aside. Rung turned on the water and made sure it was warm enough for you and watched as you got under it and actually began bathing yourself. You picked up the soap and cleaned yourself without his help, and when he tried to help, you had stepped away from him. He knew that humans seem to feel vulnerable without their coverings from accounts of his patients, but this seems more like more that that
After you finished bathing and he turned the water off, he handed you an absorbent cloth and watched you dry yourself. You seemed uncomfortable with him watching you from what behavior and body language you displayed and so he picked up your old coverings and bathing supplies and left to bring back new coverings
After you were dressed, he brought you to his berthroom and showed you your nest, he watched you crawl in and get settled before he turned off the light and left the room
After a few cycles, he continued to observe more and more of your behavior and came to a horrifying conclusion that humans are sentient. The more he observes of you, the more he truly understands how sentient humans are
He begins to document human behaviors in all the different humans he sees and starts drawing comparisons between human and Cybertronian traits both physically and mentally. Really wishes he could fully understand the human mind and has begun to look into and research organic psychology and psychiatric medicine for organics. He eventually comes across a human forum of bots asking about different human related things and helps people out by answering questions. For example, a bot asked why their female human was so lethargic and constantly seeking heat while going through their monthly reproductive cycle. Rung told answered and told the bot specific body languages to read that could indicate pain. He also advocates regularly for bots to create various enrichment activities and problem solving games for their humans and even helps create them since he knows humans are highly intelligent
He went as far as to test you with various puzzles of varying difficulty and when they were too obvious like shape puzzles for sparklings, you gave him such an angry look and started yelling at him, you even threw one at him. Further proof of your intelligence and the fact that you got upset about him giving you something too easy, after too many puzzles and being given treats after each one, he learned that humans can be vindictive. Where you got the Energon goodies, he doesn’t know, but when he would do things for you, like give you food and water, you would reward him with a piece of Energon goodie the same way he did after a puzzle. You always gave him a smug look and patted his hand in praise like he would do with you. He stopped giving you puzzles and tests shortly after
When he decides to board the Lost Light, he finds that some of the other bots have humans and suggests building or creating a designated area for them to bring their humans to interact with each other. After hearing of the idea, Rodimus accepts it and builds what he later dubs as ‘Roddy’s human Park’. It’s basically a dog park/playground with areas to climb, run around and play with seating areas for the bots where they can keep an eye on their humans
Rung watches you communicate with the other humans and observes all of the humans behavior. One human that seems to stick to themselves he realizes belongs to Skids, and after observing them for some time, he concludes that they have social anxiety. This only further proves that humans are sentient
After teaching you to say his name in Cybertronian, he also managed to teach you other words by repeatedly, and slowly saying the word associated with an object and showing you said object. Having realized that human vocal cords aren’t often capable of producing certain sounds necessary for Cybertronian speech, he made buttons with recorded words for you to press. (Just like humans do with dogs)
After the spark eater incident, which you happened to witness the spark eater attack Rung in his office, you continuously stayed by Rung’s side. You refused to let him out of your sight, only taking breaks to relieve yourself, then you’d be running back to him. You even refused to sleep unless he held you or recharged with you. He understood that not only were you scared of the spark eater, but you were scared of loosing him. You would panic if he was out of sight for too long, or desperately try to open doors to get to him
When Fortress Maximus was holding Rung hostage, none of them knew that you had snuck into the room through the vents (curtesy of being taught to navigate the vents by other humans). When Max held his gun in front of Rung’s face, they were all shocked when you started kicking Maximus’s ped and climbed up Rung and stood in between the gun and Rung’s head. With tears streaming down your face, you stared down Maximus as you stood your ground trying to protect Rung. Seeing a defenseless creature trying to protect its owner with its life had actually gotten through to Maximus, enough for him to stand down, seeing the fear in your expression reminded him of himself. After he stood down and withdrew into himself, you walked over to Fortress Maximus and tried to console him, much to everyone’s fear
It took more therapy from Rung himself to convince you that he was okay, that he wasn’t going to die on you. After some time, he began to realize that you were attached to him and saw him as more than a companion. When you tried to get his interface panels open while snuggling one cycle, he had to stop you and was stunned that you even knew how or where to try to manually open his panels. If only he could understand human speech then he could prevent the others from teaching you things
Watching you interact with his patients like Fortress Maximus, Megatron and Whirl, is fascinating and proof to him that humans are sentient and deeply empathetic. When you seem to sense that a bot is uncomfortable or is having/experiencing emotional distress, you’ll often go and sit on or climb onto them. Laying on them and doing stuff like having them rub your stomach, scratch your back, carefully play tug of war with them, or give them a laser pointer and chase the dot for their entertainment
If they visit a planet that is organic friendly then he has the medics check to see if the planet is habitable for you and in the event that it is, he brings you to the planet’s surface and lets you run around and explore as he follows you. He watches you try to interact with native organics and makes sure you don’t get hurt. Sometimes, he wonders if you would be better off on an organic world. Should he leave you here? Would you be happier here? Some nights, as you sleep, he feels immense guilt over the fact that his people took you from your home. He occasionally fights with himself over the thought of letting you go if he ever is able to take you to earth. He would miss you, he never realized how lonely he was before you, but you deserve to live and be free amongst your people. He berates himself for wanting to keep you and other selfish thoughts
Rung has had to set obvious boundaries between you both with much difficulty. It was only after he came to after recharging that he found you, having successfully managed to open his interface panel, attempting to eat out his valve. Both mortified and disturbed, he made it very clear to you that he was not happy with your behavior. He knew you were probably frustrated since many of his patients have told him how much their humans love to interface with them. He knew not having a partner must be incredibly frustrating for you so he has made sure to help by getting you plenty of self servicing toys
While he refuses to sexually engage with you, he will let you cuddle with him. If you keep trying to copulate with him he will assume that your needs aren’t being met with the toys and will get you better ones, he’ll even go as far as to ask Brainstorm to invent a device for you for this purpose. Basically helps Brainstorm design a literal fucking machine for you. Even if Brainstrom ridicules him for it. Brainstorm did suggest using his human holoform to interface with you and even volunteered to make him a mass displacement device so Rung could be the same size as you. Rung politely refused
He is incredibly ashamed to have even entertained the idea of using his human holoform to interface with you. He thought about it, in regards to giving you a human companion but realized since he can’t communicate with you that it wouldn’t work. He is deeply ashamed whenever he has indecent thoughts about you, not that it ever stops those thoughts or keeps him from servicing himself to thoughts of you in his washracks
Overall, he spoils you constantly out of guilt and keeps a constant eye on your mental health. He brings you to the medics for regular checkups and makes sure you’re healthy. If there is a sickness going around that the humans are susceptible to, he leaves you in his room and always bathes before returning so as to minimize the chances of him carrying it back for you to catch. He loves you platonically and will never take advantage of you or admit his true feelings for you