Any fics that take the concept of humans being "mutually fictional" with ponies, and combine it with Equestria inventing some magic stand-in for transformer models, so that the ponies have created/located a world of humans who think that they created the ponies, and think that they're the ones using a talk-to-fictional-characters machine to talk to them? (Provides an "in-story" explanation for how they're communicating; allows the humans to have basic knowledge of pony things; avoids provoking existential panic or status resentment in the humans.) Ideally the story would end just as a pony "connects" to a new human to talk to, and double as a prompt pluggable into the model of your choice to let you be that human.