YA fantasy adventure book, girl and boy (twins??) girl makes a magical deal to help brother, leads a secret identity.

A QUEER FANTASY BOOK IN THE YOUNG ADULT SECTION I READ A COUPLE YEARS AGO (2018-2020) AND IT WAS A FANTASY NOVEL WITH MAGIC THAT FOCUSED ON TWO TWINS/SSIBLINGS (One boy one girl )THE GIRL MADE A DEAL TO SAVE HER BROTHER/HELP HIM WITH HIS MUSIC OR SOMETHING SO WGENEVER SHE FELL ASLEEP SHE LIVED A SECRET LIFE AND FORGOT EVERYTHING THAT HAPPENED WHEN SHE WOKE UP. THE NIGHTTIME VERSUON OF HER LEFT HER HINTS AND CLUES TO FIGURE IT OUT. SHE KISSED A LOT OF BOYS BUT NEVER HAD A TRUE ROKANCE AND THERE WAS A PARTY SCENE IN RHE WOODS I THINK. SHE FOUND THIS MAGIC BOY AND THEN HIM AND HER BROTHER MET. EVENTUALLY HIM AND HER BROTHER FELL IN LOVE AND GHEY HAD TO GO IN THE MAGIC REAKM AND THE GIRL DID SOMETHING RO SAVE THE MAHIC BOY?? I DONT CLEARLY REMEMBER AND IDK THE AUTHORS NAME OR THE BOOK TITLE

Midnight's Twins?