The League of Gentlewomen Witches by India Holton

The story centers on Miss Charlotte Pettifer, a perfectly proper Victorian lady who belongs to a secret society of witches. Charlotte takes her duties incredibly seriously, spending her days balancing high tea etiquette with casting spells and flying around in an enchanted, levitating cottage.

Her orderly life is upended when she is tasked with finding the long-lost amulet of Black Beryl. The artifact holds immense magical power, but she isn't the only one hunting it. Enter Captain Alex O'Riley, a maddeningly attractive, roguish pirate who flies a literal pirate ship through the skies. The two are forced into an uneasy, highly competitive alliance to find the amulet, sparking an explosive, banter-filled rivalry across the English countryside.