Who: Narcissa & Andromeda Black. Where: Slytherin Common Room. When: Very late at night/early in the morning. Summary: Narcissa confides the details of her situation with Rabastan to Andromeda.
Who: Sebastien Greengrass, Roarke Rosier Where: Slytherin Common Room (by the fireplace). When: After dinner. Summary: Sebastien and Roarke agree to meet after dinner.
Who: Narcissa Black & Rabastan Lestrange. Where: Slytherin Common Room. When: Very late at night. Summary: Narcissa and Rabastan discuss their somewhat complicated situation.