Honestly I would not tell people that it's subtext, because that implies bait or that it's not a real relationship. Just because they don't outright hold your hand and tell you these women are together, they are absolutely together. They behave like a married couple. THEY HAVE A DAUGHTER
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Like could actually do the wedding and they would be like "obviously roommates who married for tax benefits"
Granted, last time I really paid any attention to the issue of official confirmation was around strikers.
Nanoha and Fate: sleep together and have a daughter
I have a theory, maybe they are a couple...