Since Megatron left the Decepticons, peace has returned to Cybertron. As energy flows freely, so does life. Families, robots
You, Optimus, have been elected 'lord of Cybertron'. That is to say that you ruled Cybertron, as the Prime 13 did when they were alive
Then the warlord returned to Cybertron, earning insults. But he didn't react
He then applied to obtain 'Ostordhiench' nationality (roughly German nationality). Whose mayor refused, and only marriage would give him nationality
You were half 'Ostordhiench' and half 'Aucdientschy' (French). He called on you. Out of your goodness, you accepted. You had to live together, so you two had to live in your apartment.
Three months later
You were both walking in a Christmas market. You wanted to go there for a long time, and he agreed to take you
You tasted some cotton candy, then he patted your thigh. You turned around
The lord had one knee on the ground, and a mini 'place', inside which there was a ring
Megatron:''This time, do you want to do it for real? And so; Optimus will you marry me?''The ring was a beautiful blue reflection, Megatron looked you in the eyes