Is Gangut saying she and the Admiral conceived a child and it was Akatsuki or that Gangut and Akatsuki conceived a child? It's not entirely clear.
Now you mention it, I'm not sure myself. At thought at first when translating it, it was the latter. Then I translated the other pic of Gangut which the Admiral gave her a ring, and now I think the first does make sense.
EDIT: Well, with this new pic with Hibiki, I guess it's the first choice.