Transformers Prime: The Creator's Light

Side story

Primus and Unicron's reason they fight
when they were super young like Unicron is 14 and Primus is 10. I know they are the same age but in the mind scape Unicron grew up faster to protect Primus because their creator was at war with her sister. The castle of light had fallen and the brothers were leaving swiftly so that their creator wouldn't worry about them. Now into the past.
"Primus come on we have to go," Unicron tried to encourage his brother who was stumbling along. The castle they knew was falling apart. The guards were out fighting along side their creator.
"Unicron I'm scared. Why are we leaving? Shouldn't we help moma?" Primus had stopped and was shaking. Unicron faced him.
"Primus right now moma's sister is attacking causing the castle to fall apart. Moma is facing her. Right now we are helping moma. If she doesn't have to worry about us she'll beat her sister. Her sister want leverage over moma. She wants us. Now come on we have to keep moving." With that Unicron grabbed his hand pulled him along. They made it out side and started to head to the city limits.
"MOMA!" Primus's scream cause Unicron to turn and look up at the sky. Their creator was stabbed through the abdominal plating. Unicron's eyes misted and he looked to his brother who had tears free falling down his face.
"Come on Primus we need to keep moving," but Unicron knew it was to late.
Cynical laughter filled the air. "My my the little princes are out such a pleasant night for me. Dear sister I think you haven't gone through enough pain yet. How about I change their good spirits to dark ones," she stated more than asked as she twisted her blade deeper in their creators abdomen.
"Leave my sons out of this sister."
She just smirked and raise a hand dark black and purple energy crackled around it. Then she shot a beam down at the brothers. Unicron had to act he pushed his brother out of the way just as the beam struck. Unicron past out but everyone knew the young prince was corrupted.
Primus stared up at his brothers attacker and saw his mother crying. She punched her sister away and used her remaining strength to open a dimension portal. She pushed her dark sister though it. But the dark sister wouldn't go down easily and grabbed her sister's ped and the two were gone as the portal closed. Primus collapsed crying hard for every thing to be back to normal. At least to have his brother not corrupted.
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Well that's that you know the rest Primus and Unicron fight. Primus creates the thirteen. And that is how I believe they started fighting. Though Unicron didn't turn dark right away he was shunned so much he wanted to be equal to his beloved brother. Well till I post what happens next this is good bye. I don't own the picture.