Saved by the Water Dragon God (Realms of Divinity #1) by Alex Perez:
 
After being left for dead in the ocean by her abusive boyfriend, Liliana finds herself in Halinora, the lands of the alluring Water Dragon God, Nendori. But Nen’s decision to save her doesn’t come without consequence for both parties. If Liliana’s to get home, she and Nen must convene with the other Gods in the realms of divinity—though not all are so willing to aid the aloof Water Dragon God and his mortal pet. It doesn’t help that Nen is clearly hiding something, and Liliana’s return to Earth is anything but simple with people under the impression that she’s dead.
 
Will she be able to sort out her thoughts while Halinora and Earth are full of complete and utter chaos?