Venomous

Scorpion grew up as a deadly assasin, feared but not loved. Other dragons only saw her as a murderer. When Scorpion refuses to do a deed for the Queen, the Sandwing Queen uses her beloved as leverage and sends Scorpion off to meddle with the war for her ally, Queen Sunfire.
Scorpion sets off to kill the Icewing Queen and deliver a message to Sunfire.
But Scorpion decides her stay in the Icewing Kingdom will be a liiiittle longer than expected, she has some certain business there.....

DISCLAIMER:
Tui T Sutherland owns Wings of Fire,
I own the characters and Queens,
I own Cloudwings and Stonewings,
and some random person on deviantart owns the cover picture.