The two evil doppelgangers explained it to Mary.
They were inhabitants of the Dark Realms,and had known about the Realms of Light that Mary
came from for quite a while.
And they'd drolled and pawed at their image scopes as they'd thought about taking over
the Light Realm.
Alas there was a barrier that kept the Dark folk from crossing into the Light Realmand conquering it.
It just so happened that the Dark Realm posseesed big natural muscular red,blue and black
furred dragons who did the grunt work for the humans and could teleport
about in the Dark Realm.
The dragons were the slaves of this evil human society.
So 'Mary' and her'father',as well as others,had viewed the Light Realm through their imagescopes,and
discovered the Light Realm had stories in it about teleporting dragons as well,
the Pern dragons of Anne McCaffrey.
Eureka,the fictional dragons must have been Dark Realm dragons that had teleported into another
dimension,the Realms of Light.
Whilst Mary lay there immobilized,a screen lit up on the ceiling above her,showing the results
of some of the early tests done on Dark Realm humans who'd been injected with a serum derived from the shed fur of blue,red and black furred dragons.
The humans did not turn into anthro dragons,but scaley counterparts to the native furred
dragon races,four legged,bat winged and all.
"It seems the evil within us carries us right out of our humanity and into evil feral
dragons" explained "Mary" as she stared emotionlessly at the ceiling image of a human growing,bursting out of his straps as the serum and his own innate evil mind reformed him into
a blue skinned scaly dragons,hissing,roaring and all that.