Aspen is Dragon Kings series book 2. Series should be read in order as it is all one story.

Obsidian (Sid) is a dragon king, spending his required time living as a human.  Aspen is a human dragon aficionado.  Sid and Aspen are joined, but that’s  a problem.  Dragon Kings don’t get to choose their queens and if anybody fins out they’re joined they could be killed.  Sid has a daring plan to save them, but can they pull it off?

Meanwhile, they thought the had caught and punished the dragon who was killing humans, but when the attacks resume they must re-assess.  Can Sid catch the killer and manage to keep Aspen alive, too?

I think Aspen is a very enjoyable novel and it keeps the story moving as Aspen and Sid complete the  first half of their senior  year.