I am looking for a Severus and Harry story. This story starts with Severus being summoned to St. Margo's to give a lifesaving potion to an unknown patient. He had been charging harry potter large amounts of gold for any potion for a while because Severus knew that he was at a tipping point of owning Harrys life because he had been saving harry without asking for anything in return. Once the potions been given Severus is called back because of a blue smudge showing up on Harry's hand. This is where Severus knows harry life now belongs to him. During the story the marks grow and change as harry and Severus feeling grow and change to the point they are married at the end its no long a one sided bond but equal both ways.
Please let me know if you know which story this is XD thank you! Hydra