Actually, they BOTH became and were infertile. Back when they were young; sovieshit saw that Navier was being starved since she needed to go on a diet, with goodwill intent sovieshit stole some cookies and gave those cookies to Navier for her to eat and Navier gave him one for him to eat as well (without him knowing they were infertile cookies and Navier's mom had made to give to someone else, but sovieshit didn't knew this when he offer the cookies, however later when he found out the truth from Navier's mom, minutes later after eating the cookies, he never told Navier about both of them possibly becoming infertile due to his mistake; but they did became infertile). Rastrash without the knowledge was already pregnant when sovieshit found her, and Navier's womb was healed every time she slept in Heinley's bed since he has a magical bed, this made Navier healthier for pregnancy which eventually she did, they had twins a boy and a girl.
That's as much as I remember from the novel.
MAJOR MAJOR SPOILERS! READ AT UR OWN RISK
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NO BUT SERIOUSLY
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ITS AB RASHTAS CHILD SERIOUSLY READ AT UR OWN RISK
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Sovieshu isnt the father of rashtas second child, the father is the same father of her first child. Sovieshu is the one infertile, not Navier LMFAOOAO