Make your own story as Optimus and Megatron's kid

Optimus was letting Megatron look after you since he had a call from Ratchet to do something

Optimus: I'll be back, love you Megatron.

Megatron: love you too Optimus.

after Optimus left you stayed close to Megatron in case of any danger as you liked making chaos with Megatron and helping Optimus