The Underwater Kingdom (A Namor of Talokan fanfic)

CROSS-POSTED ON Ao3!!
Nox is a young girl of Talokan who has just come of age. Only a month into her adulthood, her mother encourages her to look for a husband. The only problem: vibranium detectors have caused all of the males of her species to be infertile. The only solution: go to the king and beg him for a child, as he is the only person left who can grant that wish. Nox hesitates on this, waiting for weeks; then a palace guard shows up at her front door...

follows the BPWF storyline mostly, begins before Shuri is kidnapped and goes from there.