The Heritage of Power - Book #4
by Lindsay Buroker
As a side note, I love the cover art on this one.
Trip and Rysha and pals are stuck on an island. They not only tracked down Trip's father, who turned out to be a long-dead dragon, and uncovered a cult of crazy dragon-worshipers, but Trip also got saddled with a responsibility he never wanted: two dozen half-dragon babies -- his siblings!
This series never lets up the wittiness and sarcasm, but it does bring in some heavy topics relating to family, love, and lots of explosions. Don't let the romance get to you, this is a rip-roaring adventure!