About what he's going to do next. It's too late to terminate the sparkling and he's ill prepared to be a carrier. His hatred for Megs grows ten-fold, the fragger took advantage of him!

ANYWAYS the vision here is Megatron making Optimus feel pretty and like a dainty femme, calling her his princess and his wife and making her blush like crazy

I'm also thinking of a crack scenario where he's looking for Optimus' spike housing during their first interface

"I can't seem to find your spike panel..."
"I uh, I don't have one."
"Hm?"
"I'm not a mech."
"..."
"..."
"...You are so beautiful--"
"Whatever."

Or maybe she corrects him once she hates him less lol

Megatron even thinks she is a mech until he either hears one of the other bots call her a she or something

"WHAT DO YOU MEAN YOU DIDN'T KNOW?!"
"My carrier protocols never activated!"
"What--How--You know what, congratulations. The scraplet is a femme."
":D"
"...She looks an awful like that frag--MEGATRON???"

Insert Ratchet harshly scolding Optimus while holding a very confused newborn