Work Text:
Ultra Magnus has always been a bit of a workaholic.
He had so many bots relying on him that it was increasingly difficult to take his nasal ridge off the grindstone. Sometimes, that meant he forgot to fuel. Others, it meant he didn’t recharge for multiple cycles. More commonly, though, it meant he waited just a bit too long to relieve his waste tanks.
One might think after one close call - or one accident - Ultra Magnus would have learned his lesson. It was hard, though, to break his habits. Especially ones that weren’t hurting anyone else.
Thus, he was right back where he’s been many times before. In front of the void room, servos tucked between his tibulens as a puddle formed at his pedes.
He hadn’t made it.
He hadn’t made it, and he’s so pathetic that he couldn’t even move as he heard someone walking down the hall. He was going to be caught with his soiled panels. He just hoped it wasn’t someone close to him.
“Ultra Magnus? Are you alright?”
Ultra Magnus could have perished right then and he would not have minded one bit. He would never have to see Arcee’s disgust with him if that happened. He’s her mentor. How was she supposed to trust him now?
“Oh, my. You poor thing.” Arcee said softly, her servos gently patting Ultra Magnus’ arm. “It’s okay, let’s get you cleaned up.”
“I…apologize, Arcee. That you have to see me like this. Please go back to what you were doing, I will clean up.” Ultra Magnus said, trying to steady his voice.
“Don’t you worry about that. Let’s get you to the wash racks before you get a rust rash.”
Arcee slipped her servo into his and began to lead him down the hall. For some reason, Ultra Magnus could not resist. He simply shuffled along with her, trying to hide his sniffles and whimpers. It’s quite uncomfortable to be soaked in his liquid waste. Uncomfortable, embarrassing, and upsetting. And of course, it’s all amplified by his mentee caring for him, like he’s a sparkling that’s had an accident.
Perhaps it’s not that far off.
When they reached the wash racks, Arcee walked over to a tub of clean solvent and turned on the heater. She waited for the liquid to steam slightly before beckoning Ultra Magnus over. He hesitated.
“I can shower. Please do not let me put you out.” Ultra Magnus said.
Arcee smiled. “You aren’t. A bath will calm your circuits.”
“But…”
He looked down at himself. He could get in and not open his panel, but it would defeat the purpose of washing when his array was what needed cleaning. He could ask for privacy, but it felt wrong when she was trying to help him. It was him that had made the mess, that had wet himself because he just couldn’t take a break. He deserved to be embarrassed. He was in no position to refuse; with a sigh, he stepped into the tub and sat in the warm solvent. The steam rose, making Ultra Magnus’ frame relax slightly.
He hoped the steam of the bath would have the steam coming from his vents.
“Little sweet, you need to open up your pannies.” Arcee cooed, pouring a bit of soap into the bath.
The words felt foreign to Ultra Magnus. They're not meant for him; they're meant for sparklings, little ones who knew no better and needed a gentle touch.
“Arcee, this really is not necessary…” Ultra Magnus tried again.
“Not everything needs to be necessary, Ultra Magnus.” Arcee said with a chuckle.
“Well, I suppose, but…this is different. I've made a huge mess, and I -”
“Now, you stop right there, little mech.” Arcee gently pinched one of Ultra Magnus’ finalis, “I want to do this for you. You're always so good to me, even when I make messes. You aren't any different.”
“Y-Yes ma’am.”
“Good mech. I'm in charge right now, so you just enjoy your bath. Pannies open so I can clean up your vava.”
Steam shot from Ultra Magnus’ vents. He shouldn't be so worked up. This was Arcee, his mentee, someone who looks up to him as a leader and a teacher. He would take every step necessary to prevent this in the future.
But for now, he would let this happen. The bath really wasn't awful.
After a few more moments of hesitation, Ultra Magnus finally opened his panels. Arcee praised him before as she picked up a sponge and set to work. She was gentle as she wiped up his armor, starting at his helm and working down. He appreciated that she didn’t look at his face as she washed his array. She was very professional about it, even.
When she finished, Arcee left Ultra Magnus to relax for a moment while she grabbed a towel. Ultra Magnus began to feel unease in his circuits again. He has let this go on long enough. This was wrong. She shouldn’t feel obligated to help him, to care for him.
Arcee returned with a large, fluffy towel and smiled at Ultra Magnus. His brooding expression was quite cute. He looked like a grumpy sparkling, thinking far too hard about something that really required no thought at all. She motioned for him to stand, holding his servo as he stepped out of the tub. She chuckled as he tried to cover his exposed array.
“Nothing I haven't seen before, little mech. Let's dry your vava and spee-spee so we can put on your training pants.”
Ultra Magnus made a strained noise. “Training pants? No, there is no need for that, I -”
“Shh, shh, nothing to be upset about. Sometimes we need help. We're just making sure you stay nice and dry, just in case.”
Ultra Magnus hated that it made sense. He didn't plan on having any more accidents, but at least if he did, he wouldn't be caught in this humiliating experience again. He reached for the towel in Arcee’s servos, but she pulled it away with a click of her glossa. He covered his face instead.
Arcee hummed as she dried the large mech off. Her poor little one shouldn’t be so embarrassed; it wasn’t anything he could help! It was only a matter of time before he became so stressed out that he couldn’t handle himself anymore. That was why he had her to care for him, even if he didn’t know it yet.
“Okay, little sweet. Let’s get our training pants on.”
Ultra Magnus finally uncovered his face. Arcee was holding out the offensively pink padding with a gentle smile. He could always take them off later. He knew that. Swallowing his pride, he stepped into the training pants. He felt Arcee pull them up until they sat on his hip plates. Her servo gave his bottom a firm pat, the garment crinkling.
“All better! I know you have some work to do, so I’ll be back to take you potty in…thirty minutes. Okay?” Arcee asked.
“I-I’ll take myself…” Ultra Magnus said, toying with the waistband of the pull-up.
“Just for today. I know it’s hard for you to get away from your work. I really want to help.”
How could he possibly say no to that?
“Fine. Thirty minutes.”
Arcee clapped excitedly. “Good mech! Run along, I’ll be back soon.”
Ultra Magnus simply nodded and hurried out of the room. He wasn’t sure he could take more of this.
*****
Like clockwork, Arcee had gone to Ultra Magnus’ office every thirty minutes. Each time, she would do the same thing.
Check Ultra Magnus’ training pants by feeling the front and looking into the back.
The latter seemed to get Ultra Magnus all worked up. He would say he doesn’t have any issues with solid waste. He’d wriggle away a bit. Never once did he push at her servos or tell her to stop; his faceplate just lit up with burning pink.
He had been clean and dry all day, and done well going to the bathroom. He hadn’t even protested about having to use a training potty very much. He just squatted and did his business. She wiped him up and powdered him before pulling his training pants back up and sending him on his way.
She was hoping, though, that he would need more help soon.
It was time for the next check. She headed to Ultra Magnus’ office to find him gone. Quickly, she headed to the bathroom. He must have needed to void and gone ahead without her. As she turned the corner, she saw Ultra Magnus as the bathroom door. He looked devastated.
As she drew closer, she understood why.
“Oh, little sweet, did you make poo-poo in your training pants?” Arcee asked, pulling the back of his pull-up away to peek inside.
Ultra Magnus whimpered. “I-I’m sorry, I tried to make it, I did not…I didn’t realize I had to go so bad…”
Arcee patted his back. “It’s okay, little love. You just didn’t know. A big poopy in your pants is nothing to be ashamed of.”
Ultra Magnus felt coolant pool in his optics. He felt ashamed anyway. He’s second in command of the Autobots. He’s much too old to be messing himself, to be wearing training pants, to be doing any of this. His tanks still ached on top of everything.
PRRRRBBBBRRRRTTT
Ultra Magnus squatted on instinct, grunting as mushy waste flooded his training pants. Bubbly farts accompanied it, each one making him wince in humiliation. He’s surely disgusting Arcee. He just couldn’t make it stop.
“Oh, you poor thing,” Arcee cooed, petting Ultra Magnus’ helm, “don’t worry, we’ll get that big, stinky boom-boom all taken care of.”
PPPPFFFBBBBTTT
Arcee held in her giggles. She didn’t want to hurt Ultra Magnus’ feelings. She just thought his farts were adorable! He made such a cute, scrunched up face while he pushed them out. After a few moments, Ultra Magnus finally finished filling his training pants. They sagged between his legs, the wetness indications fully visible.
He looked pitiful. Arcee felt her spike inflate, pressing against her panel.
“There we go~” Arcee said softly, taking Ultra Magnus’ servo, “it’s all out now. Let's get changed.”
“I-I can do it, please, it’s…it’s filthy.” Ultra Magnus whimpered.
“I’m sure I’ve seen much worse, sweetness. Now, I know you don’t like being all yucky, so let’s clean you up. Come on.”
Ultra Magnus didn’t argue. She was right. He didn’t like the feeling of poopy training pants. It was best to let Ammi handle it.
Arcee. He meant Arcee.
The walk seemed to go on forever. Ultra Magnus’ soiled pants forced him to waddle behind Arcee, looking every bit the sparkling he felt like. She spoke kindly to him the whole way. Her digits intertwined with his, firm but gentle, keeping him grounded each time his thoughts tried to spiral. Finally, they reached her habsuite. He blinked, cycling his optics a few times.
Hadn’t she had a smaller room? She had always bunked alone. He didn’t remember signing off on any changes…
“Oh, I asked Kup if it was alright. I needed some extra space and this one was open.” Arcee said, typing in the keycode.
Ultra Magnus nodded. That made sense. She has been moving up the ranks, she probably needed more workspace. The door slid open and they stepped inside.
There were two berths, one of which had safety bars. And there’s a large table, with a padded mat on top and diapers and wipes in the spaces beneath.
Ultra Magnus’ tears returned.
“Magnus, please don’t be sad.”
How could he not be? Arcee knew he was so helpless that she’d already gotten him a changing table and crib.
“I just want you to be comfortable. Look, lie down on the table. It’ll be quick and easy.”
Why bother resisting? He needed to be cleaned up anyway. He did as told, trying to ignore the burn in his faceplate. She’s already seen him with his panels open today. It wasn’t as if he had any dignity left.
Arcee smiled and rubbed Ultra Magnus’ chestplate in small circles. Even all upset, he’s such an obedient one. She was sure if she just pressed the right buttons, he’d fall right into the role she wanted him to play. She reached down and pulled out the supplies she needed. Wipes, powder, and a diaper. A nice, thick diaper, with adorable little mechanimals on them.
She opened up Ultra Magnus’ training pants and set to work. He’s made quite the mess, and it has spread through his whole array. It took her a while to get everything clean.
And for good measure, she used a wipe covered digit to gently circle inside his port and valve.
It made the big mech shudder and gasp, but he didn’t close his legs. She repeated the motion a few more times. Each time, his spike grew a bit more. It would be so rude of her to trap that in a diaper, wouldn’t it? A diaper full of gushies would be so uncomfortable.
She wrapped a servo loosely around Ultra Magnus’ spike. She moved it slowly, up and down, smiling as Ultra Magnus’ face went through several expressions: confusion, horror, shame, pleasure.
“I don’t want you to be uncomfortable in your diapy, little mech. I’m just helping.” Arcee cooed.
Ultra Magnus panted in response. Arcee noticed his valve was beginning to leak lubricant. He’s enjoying this.
Wonderful.
Ultra Magnus brought a thumb to his mouth without thinking. He sucked on it, hoping to stifle any unbecoming noises. Ammi was just helping him. That’s what Ammis did.
Arcee swiped two digits through Ultra Magnus’ lubricant and pushed them into his valve, spreading them apart. His tibulens drew together slightly, hips thrusting up. She giggled. How sweet. He’s all excited. She pulled back and pushed in again, in rhythm with the servo pumping his spike.
As expected, he overloaded quickly, leaving a sticky mess in his diaper. She simply tossed it, wiped him up, powered him, and taped a new diaper around his waist.
Then, she pressed the final button.
“I think it’s best we wait on potty training. Ammi will take care of your diapers. Ammi’s going to take care of you.”
Ultra Magnus’ processor felt fuzzy from his overload. He nodded along with her words. She knew what was best.
“Silly thing, you’re sucking so hard. Did you have any nini today?”
He shook his helm. He hasn’t fueled at all. He kept forgetting. She smiled and helped him up.
“Let’s take care of that.”
Ultra Magnus followed her to the berth. He sat in her lap when she motioned for him to. She unhooked her chestplate and opened it up to reveal her energon reservoirs.
For a brief moment, Ultra Magnus thought about refusing. Feeding from Arcee’s breast was too far. There had to be a limit, right?
But she’s Ammi. And…And sparklings like him drank from their Ammis.
So he let her trace his lip components with her nozzle before latching on, and relished in her praise.
“What a sweet bitty I have. Don’t you worry about anything, Ammi’s going to make sure you’re all taken care of.”
Ultra Magnus looked up at her, and the last bit of tension faded from his frame. That sounded nice.
“You’re not too big for me. I’ve always seen right through you.”
He wasn’t surprised. She was smart. He’s taught her everything he knows. Apparently, he’s taught her a little too well.
“Someone’s so hungry. Or is it just that you love Ammi’s booby? I’m sure everyone will get used to seeing you latch.”
Ultra Magnus whimpered. She wouldn’t show everyone, would she?
Did it even matter? Ammi knew best. Who was he to argue?
“Why don’t you close those little optics, hm? I think a nap could do you some good. It’ll give Ammi some time to finish up all that work at your desk.”
Well, at least the work would get done. He trusted her. He let his optics dim as he nursed. He was nothing but a little thing to her.
Maybe he was never more than a little thing at all.