What, you think Sisko and Garak are going to chat about Vreenak over a beer and a kanar at Quarks? No. They're going to talk about it absolutely never and take the secret to the grave with them, probably with the strong encouragement of Starfleet Command. Sisko is going to have to live with it, without even help from a counselor or Dax. So's Garak, but he's used to living with deep dark secrets.