Prompt:
Imagine your OTP has a young child who one day, unknowingly, says a swear word. Person A is horrified and scolds the child, making sure they never repeat it. Meanwhile, Person B can’t stop laughing.
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Cyclonus lounged back against the railings, it was strange how the crèche he now overlooked had pretty much sprung up out of nowhere.
Or was it always here?
He wouldn't have known as it was not something that required his attention prior to the arrival of his son. A son he was currently keeping an eye on.
Conquest didn't seem too fond of the Sweep pups when he was initially placed in the pen and would actively move them away from himself or away from their curious touch, but now he seemed not to care what the young pups did as they tossed and twirled play-fighting with each other, under developed wing struts flapping happily as they chewed on each other with tiny dental units substituting adult growls for small infantile squeaks.
Cyclonus had been a bit preoccupied with keeping his gaze upon the group before him he hadn't noticed Galvatron enter and sidle up next to him and rest his chin upon his arms leaning on the rail. Noticing his mate but not saying a word Cyclonus leant over to press a kiss to the other's helm earning a rare gentle smile off the other. Both returned to watching the youngsters within the pen. Conquest seemed not to acknowledge his carrier's entrance and remained preoccupied with whatever was in his hands, it appeared to be one of the box-shaped puzzle toys that had been placed there for a Sparklings entertainment. It wasn't Conquests usual favoured toy but today the simple puzzle had his attention. A Sweep cub soon seemed to become interested in what the eldest child in the crèche had that absorbed his attention so much, and it padded over and peered at the object in his hands. Conquest looked up at the cub, probably about to say something from his currently-limited repertoire of words he could speak but his momentary distraction caused his hold on the item to slip and the cube went flying causing all the cubs to scatter.
"Fuck!" Conquest yelped without a moments hesitation.
Cyclonus's mouth fell agape and Galvatron drew back to his full height.
Unaware of what he just yelled Conquest hurried over to grab the near-completed puzzle he had dropped.
"Conquest!" Cyclonus snapped causing the sparkling to turn to him, wide-opticed and innocent. Galvtron started making a odd low noise as Cyclonus strode over to their son and knelt in front of him "Just where did you hear that!?" he placed a hand upon the infants shoulder and Conquest looked confused
Why? What had he said wrong?
Galvatron had lost all control and descended into hysterics.
"I mean it, who taught you that!?" Cyclonus continued to try and scold his child for swearing, but Galvatrons loud laughter drew Conquests attention more than he did, recognising the happy sound Conquest smiled happily thinking he had done something good.
"I... Ooooh" Cyclonus pinched the bridge of his nose, there was no way he was going to get anywhere with Galvatron laughing so hard.
"N-n-nn-n-n-no, tsche he he, g-go on, pffff, w-who taught m-my little prince to s-say that?" Galvatron wheezed out before cackling loudly again and slamming his fist on the railings burying his face in his arm. 
Conquest still looked a little confused but he raised a hand to face and tried to think
"Uuaah dark guy, purple face, wheels" he listed off the features he could pronounce and associate to whoever said it.
"Right" Cyclonus sighed "Don't say it again" he patted Conquest on the head and the young mech smiled toothily back up at him. He looked up at Galvatron who was now relying on the rail to keep him upright as he continued to laugh. 
Guess it was going to be his job to chastise Motormaster then.