Matilda (Tilly) Lillian Snape is the twin you never knew existed. Tilly is Harrys younger sister by 15 minutes, she never connected with James but, when she met Severus Tobias Snape she had an instant love for him. Even when James was alive Tilly felt as though Severus was her father, not James. On that fateful night, both twins sustained the lightning-shaped scar. Harry on his forehead and Tilly on her collarbone. Tilly follows the darker path compared to Harry. Having the Potions Master as your father, the Malfoy heir as your best friend (and slowly falling for him), and Harry Potter as your twin, while being the hidden chosen one, can come with difficulties.
Come along with Tilly as she finds her missing half, protects those she loves, falls for her best friend, and fights for the wizarding world. Also, see a side to Severus Snape that not many believed he had; a kind, caring, loving and protecting side, for his daughter.
The War is nearing, and Tilly is stuck in between both sides. With Voldemort on her back, wanting to have Harry in his grasp as soon as possible. Harry and everyone watching her every move, in case Draco or Snape try to reach out to her. But what they don't know is Tilly made it clear to the two closet people that she wouldn't be seeing them very often over the next year. Will she be able to survive a year without her Dad and Best Friend or will the pressure and stress get to her? Will being away from Draco prove to be a problem with a certain ginger hair twin comes back into her? How will the next year make her even stronger? Friendships will be tested. Hearts will be broken. Lives will be lost. But will it all be worth the trouble in the end?