Story of a Sparkling-Transformers fanfic
An ambush. That was all there was to it.
The Prime was alone at that time, launching his only sparkling off world to protect her. He was so close to losing her to the Decepticons, at least that was what he thought.
He was left heavily damaged, leaking energon, for the other Autobots to find.
The priority was not the Prime, but his sparkling. Their objective had been achieved, they did not need to do anything else. Optimus Prime was for their Lord and master to defeat, not them.
It is quite a short story, apparently.
Oh and TF does not belong to me, I only own my characters and a few ideas and stuff. Everything else belongs to their respective owners.