The thought makes Hermione laugh, especially when she considers the abrasive and bitter portrait subject covered by an enchanted curtain downstairs, refusing to be removed from her home. Hermione reads further and realizes that Marion’s betrothed is Orion Black, which would mean that they never marry. They couldn’t have married, not when Orion was famously involved in the scandalous union with his own (not even distant) cousin Walburga. 