Despite it being Winter Wishday, Opaline's quest to secure dragon fire still remains the same. And as usual, she's sent her helper, Misty, to obtain it. And while the unicorn is on her mission, Opaline decides to take care of some "important" matters around the lair. What kind of matters? Well, one's that require her full attention and must not be interrupted by anypony.
I can imagine this as an episode of TYT that took place before Misty’s reform.