Sincerely, H.A.B.
Declaring your relationship in the midst of war was dangerous, unless you were untouchable. They were best kept secret, until it was safe.James Potter thought he could have it all- a marriage to Lily Evans, and a relationship with Regulus Black. Until, of course, he wanted an Heir.
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Hydrus Arcturus Black is born on the 8th of May 1980. Henry James Potter is born on the 31st of July 1980. Two very different boys, with very different lives.