Broken Zipper: Riverdale Fanfiction.

In "Broken Zipper," a new girl named Amy arrives in town and catches the attention of Jughead. He soon discovers that Amy is actually Archie Andrews' step-sister and has been keeping her identity a secret. Jughead and Betty become suspicious of Amy and start to investigate her past, hoping to uncover the truth. However, Amy is determined to keep her identity hidden and must navigate the challenges of making friends in a new town while also keeping her secret safe. As Jughead and Betty get closer to the truth, Amy must decide whether to trust them or keep her secret safe at all costs. The story explores themes of identity, friendship, and trust as the characters navigate the complex relationships in their small town.

Only Amy is my own character, the rest credit to the show.