Lost: Spellbound book 2 (Fred WeasleyxOC)
40 parts Complete She survived the basilisk.
Now she has to survive everything that came after.
The summer before fifth year, Epona Kelleher-muggle-born Slytherin, Parselmouth, and "the girl who wouldn't stay dead"-is barely holding herself together. Her only lifelines are a part-time job, a black Bengal cat with too much attitude, and a stack of ridiculous letters from Fred Weasley. By the time she finds her way back to the Leaky Cauldron and Hogwarts, she's different: thinner, quieter, and haunted by a death she never really faced.
With Dementors at the gates, an escaped prisoner on the loose, and Slytherin House turning its back on her, Epona is pushed onto the Quidditch team and straight into a rivalry with Fred that feels a little too personal. On the ground they're best friends who won't admit what they want; in the air they're Slytherin vs Gryffindor, all sharp turns and sharper banter.
LOST (Book Two in the Spellbound series) is a canon-adjacent Prisoner of Azkaban retelling about trauma that won't stay buried, magic that asks for hope, and two idiots in love who are the last to realise it.