The Man Who Won the World (Quiet x male reader)

after an encounter with the Skulls Y/N and his squad got captured by Snake to join the Diamond Dogs. Now that he's in on the other side what he will do? what are the things that he will change? And what are the things that will change him? I don't own Metal Gear The Phantom Pain or any other Metal Gear game, Hideo Kojima is the original owner of those games.