Responses
Oh! There's a thread in novelupdates. Here's the link
https://forum.novelupdates.com/threads/wild-girl.81847/
If you scroll down enough, you'll find a person, who read the novel, giving out spoilers on demand.
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According to the spoilers I read, Captain is shocked because Roel was allegedly a man and two men can't get married (in their world). When Roel clears it up for him, he accepts it and loves her regardless.