Optimus x megatron
Angst, soulmate au

Optimus prime was hurtling straight For Cybertron's core he knew he would have to end his life in order for Cybertron to be reborn, as the bottom neared Optimus felt his spark flare in his chest and a string of silver exploded into existence onto his right digit, as he layed at the bottom of the well and watched the matrix remove itself from his chest he smiled. His last dying thought was of his soulmate Megatron.

On the other side of Cybertron sat Megatron in an abandoned Energon mine thinking back on the past when he felt his spark ripple in pain, a bright blue string lit up across his digit right before a scream of anguish rippled across the night, Optimus prime had died.