A/N - More Sideswipe in this one as well - I'd forgotten how much of my twins headcanon backstory was in these.
"Extraordinary," Perceptor murmured, as he increased the magnification even further. "Your components have adjusted to allow for movement even as they expand. Your left major arm strut has actually increased in length by 0.00000493% since I began this examination, a remarkable feat indeed." Roller beeped at him in agreement.
"So, what do you think?" First Aid asked.
"I concur with Ratchet; his current growth rate should not prove an impediment to scanning an alt mode."
"Oh great," Sideswipe groaned. "Now the little scrap's gonna be mobile?"
"Sideswipe," Perceptor chided, attempting to return Roller to First Aid.
"You have to admit, he is kind of pathetic." Sideswipe winked one optic at the tiny mech. Perceptor huffed indignantly. Roller giggled.
"For your information, Roller is a marvel of…self assembly…and…" Perceptor seemed to be having difficulty detaching Roller's hands, which were firmly flattened against his lower armplate. "First Aid, you never mentioned he had magnetic attachments in his upper digits. And his lower ones," he added, as Roller's foot components clamped on tightly as well.
"He didn't," First Aid sounded startled. "At least he didn't last time I scanned him."
/You were pretty pathetic, too, when you started out/ Sunstreaker sent, crossing his arms and leaning casually against the wall of the medbay, watching as First Aid attempted to detach Roller from Perceptor's arm.
/I was?/ Sideswipe blinked, prodding at his brother with tentative curiosity through the bond. Sunstreaker rarely volunteered information from their lives before the gladiator pits, and Sideswipe had learned that pushing too hard would only end…badly.
Sunstreaker transferred his gaze to his brother for a long moment, blue and inscrutable. /Your spark had trouble integrating with your frame at first. I carried you around your whole first vorn/ And there had been much more to it than that, Sideswipe could sense, but Sunstreaker withdrew with his usual maddening reticence on the subject.