A series of New York Times bestselling fantasy books by Aprilynne Pike, featuring a young home-schooled girl named Laurel Sewell who transfers to public school, finds out she's actually a faerie changeling, falls in love with two boys, and fights trolls. The first three books are titled Wings, Spells and Illusions; the fourth one, Destined, was released in 2012.
These books provide examples of:
Aesop Amnesia: Laurel is unfortunately prone to this. She ignores her mentor Jamison's warning not to get complacent - twice - and Shar's warning (see What the Hell, Hero? below) has no effect on her actions whatsoever.
All Myths Are True: Laurel is constantly finding faerie history behind various legends: A Midsummer Night's Dream, King Arthur, even Genesis.
Fantastic Caste System: Faeries are divided according to the season of their birth: Winter (the ruling class, extremely powerful and rare); Fall (healers and scientists, including Laurel); Summer (entertainers, illusionists) and Spring (the working class, including Tamani). Unlike some examples, the Spring faeries are still very well off — no unemployment, poverty, etc. — but the protocol still grates on Laurel's democratic nerves.
Hooked Up Afterwards: Chelsea and David, though it's subverted in the epilogue when it's revealed that Chelsea and David eventually broke up.
I Have a Family: Shar, admonishing Laurel to take her mission seriously: "I have a daughter, did you know that? (...) And I'd like her to have a father for at least the next hundred years, thank you very much."
I Want My Beloved to Be Happy: Chelsea to David when he falls in love with Laurel. Though after Illusions, she might have a chance with him after all ...
Neutral Female: Subverted. When David and Tamani get into a brawl over Laurel, she breaks up the fight, tells them she's through with both of them, storms off - and spends the rest of the day kissing Tamani.
No Periods, Period: Laurel never does get a human period, but the faerie equivalent - growing a blossom out of her back - is discussed in detail.
Snicket Warning Label: In the end of the final book in the series, the author warns the readers that they shouldn't read the epilogue if they don't want to spoil the happy ending. David and Chelsea get together, but break up. David decides he wants to erase all memories of meeting Laurel, getting involved in the faerie world, and killing all the trolls.
Sword In The Stone: The original Sword in the Stone can be found in Avalon, and only humans can touch it.
Test Kiss: Laurel shares a literal, scientific test kiss with each of her boys: David, to find out if she exhales oxygen like a plant, and later Tamani, to see if she can "sense" him with her Fall faerie powers.
Took a Level in Badass: In Spells, David starts bodybuilding and reveals his skill with a gun in order to be more helpful to Laurel.