There are 5 books in the Alien Overlords series. The newest book is Theirs to Forever .

1
His to Claim

By Taylor Vaughn , Eve Vaughn , Theodora Taylor

Book cover of His to Claim
My alien overlord is huge, all-powerful, and determined to claim me. Every human girl growing up on New Terrhan knows one thing … that she will be taken by one or several Xalthurian males when she turns twenty-one. The Xalthurians are rough, domineering, and huge all over, but this is…
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2
His To Steal

By Eve Vaughn , Theodora Taylor , Taylor Vaughn

Book cover of His To Steal
AN AMAZON TOP 100 BESTSELLERThe Xals do things to the girls who try to run. Bad things they don’t necessarily recover from… I’ve grown up my whole life knowing that after a woman turns twenty-one in my settlement, she must submit to being mated by our alien overlords, the Xalthurians.…

3
His to Keep

By Theodora Taylor , Eve Vaughn , Taylor Vaughn

Book cover of His to Keep
My alien overlord is green, feral, and determined to keep me.All of us girls growing up on New Terrhan know that when we become of age, we must submit to our overlords in a special ceremony. To my surprise, though, the alien warrior who hunts me down gifts me with…