I’m glad you’re enjoying Megatron/Starscream, it is a lot of fun :) As for anatomy terms, there are a lot of different ones! Spike and cord are common analogs for penis, while valve and port are common analogs for vagina (I say vagina instead of anus because valves/ports are pretty much always written as self-lubricating, which anuses are not). Direct comparisons to anal sex are rare in TF fandom, but I have seen the terms rear port or waste port used for this. Some authors use a lot of other “robotic” sounding anatomical terms, like glossa for tongue and servo for hand, while others do not. It’s really a personal preference; TF canon isn’t at all consistent about the use of such terms so there’s definitely no rigid standard for fan fic! I guess one suggestion would be to read a lot of fic and just make note of which anatomy terms turn you on and feel natural vs. which ones break the flow of the story or sound awkward for you.
Does anyone else have suggestions/thoughts/encouragement surrounding this topic? (Positive and nice comments only, please.)