Secret_Writer_551
At birth, protectors of the Blue Moon Goddess are chosen. On his 11th birthday, he's whisked away and is on duty to protect his Goddess. As a reward, on his 16th birthday, he is given the opportunity to choose his mate. Its a process that's to be taken very seriously because the warriors weren't born with mates, and there's no 2nd Chance Mates.
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Marion didn't take the choosing process seriously, slipping up and choosing the wrong mate. Instead of the female he had his eyes and heart on, he chose a male.
Her brother.
[WARNING: This book is boyxboy, meaning that it is gay, with mpreg. If you do not like these kinds of books or are homophobic, do not read]