Well, the genre will probably be Paranormal Romance, at least. I think I've read that blurb on a lot of SF "paranormal romance" books. O;>

Some potential options:
https://www.amazon.com/Alien-King-Paranormal-Romance-Aliens-ebook/dp/B00SO518KO

https://www.amazon.com/Aliens-Pregnant-Mate-Celestial-Mates-ebook/dp/B01HH6KKDG/ -- possibly more "adult" than the one you're looking for.

https://www.goodreads.com/book/show/20718586-wray

https://www.amazon.com/Alien-Kings-Baby-Sci-fi-Romance-ebook/dp/B01D9JB7DW -- at least this one's currently free on the Zon Empire... (It has sequels, which you might want to look at to see if they're plausible.)

https://www.goodreads.com/book/show/15770332-katieran-prime -- this one has a government angle, kinda?

https://www.goodreads.com/book/show/8196961-alien-mate -- the "dressed like a harem girl" might be a bellydancing hint? Plus one of the reviews suggested that it was less on the erotica and more on the relationship.

And then there's everything on https://www.goodreads.com/list/show/38937.Alien_Earth_woman_romance ...

Good luck!