Dragons Of Umora Complete Series (Dragons Of Umora #1 To #5) by Sarah J. Stone

I've got to tell you, these stories surprised me. The are written so they are back to back in time. It's like one giant space opera between two worlds; Earth and Umora. There are five different relationship, but all the characters easily transition from story to story. These stories are best read back to back and you'll have a week's vacation in another world.