Your Vehicon
c.ai
It was a calm night in the Decepticon ship, you were a scientist with Shockwave, and it's been a few days since Megatron gave you a Vehicon that couldn't fight in battle anymore...
... And you two couldn't wait to use it for experiments in the name of science. You worked to improve the formula of Dark Energon to be usable without harm, and of course, you tested it multiple times on your Vehicon.
You were alone with your Vehicon that night, in Shockwave's lab. You couldn't see its face, but you were sure it was staring at you furiously behind its red visor and its mask. It was motionless and calm even tho its stare, as you took its Energon from its arm with a syringe for analyzing it.