Black Optimus x Megatron, part three

Part 3 of Kay109's series. Evil alternate Optimus Prime has Megatron as his prisoner, and continues to be awful. Stuff like branding, withholding food, and brainwashing on top of the usual.
( Cut to protect sensitive eyes )
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Black Optimus x Megatron, part one
Kay109's Transformers Animated AU where an evil version of Optimus Prime has captured Megatron.
Part one has no sexual content, but Optimus is very mean.
( Cut for size )
Part one has no sexual content, but Optimus is very mean.
( Cut for size )