Now as can be expected TransDem Corporation has placed various
safeguards to prevent the kind of permanent changes that Mary and other "extreme tf" folk might use the Chronivac's for.
What Mary and the other extremists didn't know was that
TransDem keeps a small army of consultants,fixers and trouble
shooters to reverse the kinds of tf Mary and the other extremists
engage in.
So under normal circumstances the fixers in that TransDem room
would have remotely reversed Mary's Chronivac settings after
a half hour or so and deleted from her memory
what had happened whilst she was a pet dragoness.
Likely a fixer would have also deleted Mary's burning desire
to chuck her humanity.
There are plenty of such tweaks that TransDem fixers make to
the human population every day.
However the system has its glitches,which the fixers don't know
about and one of those glitches happened during the moments
Mary the human was playing with her Chronivac.
Basically dozens,perhaps more then dozens of other humans
all decided they also wanted to be dragons and dragoness's at the
same time,some feral,some anthro,some sentient,some not.
So the overloaded Chronivac networks around the world
suffered a blackout,a time when reality ceased to exist for
everyone,including the TransDem fixers.
When the Lights turned Back On
so to speak
a new flesh and blood species of being existed and always had as
far as humanity was concerned.
Mary was of course a member of this new species of reptile
commonly referred to as thermodynes
and since there were dozens,if not hundreds of thermodynes in
the world,life got complicated for Mary's former species.
Mary,being a young beasty didn't know the complexity,but Sarah did and so did Mr Phineas Smith,once Mary's father
and now a researcher on thermodyne genetics ,biochemical magicks and its effect on the human mind and body.
In other words Phineas and other humans knew that Mary's blood was mutagenic in humans.