Ok, so this conversation was to take place in Chapter 6 of Until That Day... during Violetwind, Knock Out, Kup and Hot Shot's conversation on factions. I wrote it before realising Knock Out doesn't have a Decepticon Symbol on him. (Which made me so disappointed when I had to scrap it). But you can have a read anyway and see what they might have said if he did have one.
(Also I apologise for not getting a chapter out this week. I went away for the weekend and wasn't able to edit it.)

Con Symbol

"Perhaps you need a guard around here," suggested Hot Shot.

"Ha, not like anyone would take the job. They don't like to come around here as it is," the red medic frowned as he returned with the objects he needed.

"Oh, I see," muttered Hot Shot as he spotted the Decepticon symbol on the mech.

"Heh," Kup grinned to himself in amusement, "Never thought I'd have my arm put back on by a Con. They usually try to take them off!"

"Ex-con," the femme corrected. "He joined us."

Knock Out agreed with a nod as he placed his supplies down, "That's right, and willingly too."

The blue mech pointed at the symbol on his (wherever). "Why don't you get it removed then?"

"It might be a good idea, Knock Out. It would certainly help prevent incidents like yesterday..."

The mech looked at them like they were crazy. "And risk having my paint scratched?"

'Haha that Knock Out. He's such a riot.' Windy scoffed.

"Of course..." Violetwind rolled her optics.

Laughing Kup reached over an slapped the medic on the shoulder with his good arm. "That's it, lad. Keep your priorities straight."

Lifting a hand to her mouth, Violetwind hid a grin at the grimace on Knock Out's faceplates at being touched. He looked like he wanted to say something rude and was about to speak when Hot Shot spoke instead.

"You're more worried about your paint than whether others' trust you or not?" he raised an optic ridge with a look of disbelief.

The red mech huffed, preparing some of the new wires for Kup's arm. "Never really cared about anyone else anyway. Just so long as I'm in pristine condition. Only care when someone even thinks about damaging it."

'Or for your own spark,' Windy added.

Grinning, Violetwind rolled her optics. "I for one still think you really should change it, or at least have nothing there. Maybe you could get another symbol. Something that looks better."

Windy snickered, 'Like his own face. I'm sure he'd like that.'

"I reckon you could get someone to do that. A good metal worker could fix it up real good. If you're really one of us, you'd seriously consider it. Unless your ties to them are too strong to truly give up on," Hot Shot said, his voice keeping a calm tone but issuing a challenge with his optics.

Glancing up from teasing apart the torn wires in Kup's shoulder, Knock Out shot him a glare, "If you don't like things you can just leave. I'm sure there's an Autobot medic who could see to you. We were ready to go home anyway."

"Cool it, young-en," the old mech grinned, "I'm here now and you're working fine. Hot Shot just likes to tug on your stabilisers."