The Battle of Hogwarts was finished. Bodies had been gathered up and separated as to Death Eater and the Light. The Weasley clan was grieving over Fred en masse, until a sight across the Great Hall roused Ron into furious action. Hermione was enveloped in a pair of red-clad arms. Krum! Ron got to his feet and lunged for the ex-Quidditch champion. Viktor felt someone pull his arms from Hermione and swing him around. He wasn't expecting the punch that hit him in the jaw. He acted instinctively, punching back and hitting his assailant in the eye. It was Weasley. Viktor hit him twice more before Ron finally went down. Hermione was livid. How dare Ron attack Viktor? The Weasley clan gathered around in time to hear Viktor telling Ron off as he pulled the younger man to his feet.
"Listen, Weasley, you have no rights here. She was never yours. Ask her. She will tell you. We were married before your brother's wedding. She is mine. She carries my child. Leave her alone."
With a wave of his wand, Viktor removed the Disillusionment Charm on their rings as Hermione reached up to touch his jaw. She kissed her husband and said, "Ron, he is telling you the truth. I have loved him since fourth-year. You are my friend, just as Harry is. But Viktor is my soul-mate."
Ron & Viktor get in a fight over Hermione was the prompt from Hermione