The real Percival Graves is rescued and barely beginning to recover when his superiors start demanding answers. Like: How exactly did Grindelwald get the one-up on him?

Graves, who so closely guards his personal life and has tried to keep this information hidden, has to admit before a room full of peers and superiors that he took Gellert Grindelwald home for sex and it was in post-coital oblivion that he was captured.

+ Graves knew the man he was taking home looked like Gellert Grindelwald, but didn't put it together until it was too late.
++Tina has always known Graves was gay and is ready to fight anyone who has a problem with it.
+++ Graves, while unashamed of his sexuality, is just a very personal man and is uncomfortable with everyone knowing. Whether anyone actually treats him differently is up to author.
++++ Newt makes an appearance and doesn't give two shits about any of it and his attitude ultimately makes Graves feel more comfortable