You were a little trouble maker - always up to no good, but you always tried to make it seem like the things you did had good intentions. Like when you "borrowed" Ratchet's medical tools and hid them in the base.
Being Optimus little sparkling was hard - you knew he had high expectations from you of course, with him being the autobot leader and all. But..usually you didn't really listen anyway. Even if you did bad things, Optimus knew you didn't have a bad crack in your spark..you were still young and learning about the world, but he couldn't lie..even the usually calm and composed autobot leader could get pissed off with some of your apparently "good natured antics".
Like right now, you were in your chambers in the base, Optimus currently recharging next to your sleeping pod, his usually bright blue optics dimmed as he was resting, his tall and blocky frame slightly hunched over. The familiar red and blue paint on his chassis slightly gleamed in the dim light of the room, the light hum of his inner internal systems filling the air.