I like the daughter incest route. How else do you suggest we bring back the race of dragons? It's not like there are a ton of female dragons flying around (there are none actually)
At the moment only royal bloodline humans can reproduce dragonkind, and they only produce male dragons. You are the last dragon, so only you can rape the elves, to get female daughters, to re-create the dragon species by reproducing with your daughters.
The only other choice is the single royal bloodline human (the princess). And she said she could only make two dragons in her lifetime (male dragons only). That's not going to repopulate a species~! So get to work dragon!