The Puritan Coven Series by Louise Cypress

A nerdy high school senior transforms into a vampire vixen who's unaware that her hunky date for prom is the slayer sent to destroy her.Morgan Taylor-Jackson can't wait for high school to end. In six months she leaves for UCLA and says goodbye to La Jolla, California and her parents' messy divorce. But when Morgan is bitten by a four-year-old boy, she becomes infected with a mysterious condition. Fever, insomnia, and a new bustline are only the beginning; Morgan morphs from nerd to bombshell... moreA nerdy high school senior transforms into a vampire vixen who's unaware that her hunky date for prom is the slayer sent to destroy her.Morgan Taylor-Jackson can't wait for high school to end. In six months she leaves for UCLA and says goodbye to La Jolla, California and her parents' messy divorce. But when Morgan is bitten by a four-year-old boy, she becomes infected with a mysterious condition. Fever, insomnia, and a new bustline are only the beginning; Morgan morphs from nerd to bombshell.As far as Van Xander is concerned, all vampires are evil, even the ones who reject human sacrifice and call themselves Puritans. When Helsing Incorporated sends Van to La Jolla to investigate the local coven, Morgan is his prime target. Pretending to be interested in her, Van asks Morgan out and puts her through a series of tests to determine her killer nature.Morgan is thrilled to be dating a hot guy like Van and falls for him hard. As Van strings Morgan along, he grows increasingly guilty. Morgan is kind, compassionate, and a gooey romantic. Just as Van's mind begins to change, evil forces threaten everything. When prom night arrives, there are only two ways out of the ballroom: death or immortality. less

An all-girls vampire camping trip turns deadly when a sasquatch hunter is accidentally killed.
All Esma Siban wants this summer is to stay out of her stepmother's way. When her stepsister, Morgan, suggests a road trip to Oregon to visit a friend from high school, Esma jumps on the idea. A camping trip sounds like the perfect way to help Esma recover from breaking up with her boyfriend. But when Esma and Morgan encounter a stalker, Esma's fangs come out... moreAn all-girls vampire camping trip turns deadly when a sasquatch hunter is accidentally killed.
All Esma Siban wants this summer is to stay out of her stepmother's way. When her stepsister, Morgan, suggests a road trip to Oregon to visit a friend from high school, Esma jumps on the idea. A camping trip sounds like the perfect way to help Esma recover from breaking up with her boyfriend. But when Esma and Morgan encounter a stalker, Esma's fangs come out. The death of a Sasquatch hunter wasn't on their itinerary. A terrified Esma is unsure what to do next, so she texts her ex-boyfriend for help.
Chase Wheeler feels like the biggest fool on the football team. The entire time he was dating Esma, he had no idea she was a vampire. In high school Chase did exactly what Esma told him to. He let Esma plan their dates, pick his wardrobe, and even pack his lunches. Now Chase has a month left before he starts college to forget the girl who froze his heart.
When Chase lands an internship on the popular radio talk show Fred Head, he finds his voice and charts a future that doesn't involve domineering girlfriends. But all it takes is one text from Esma and Chase runs back to her waiting arms. Chase finds the courage to tell Esma that he's through with being bossed around right when Esma realizes that she desperately needs Chase's input. The only way home from this camping trip is to be bitten or smitten. less

He's a vampire bad boy. She's a slayer's daughter who's never been kissed.
Kyle Logan has been a sixteen-year-old bad boy for three years, ever since he became a vampire. After a stint at the rehab center run by the Brothers of Temperance, Kyle has finally kicked his blood addiction. Now, he's back in high school with one goal in mind: stay clean so that he can grow up and become an animal rights activist... moreHe's a vampire bad boy. She's a slayer's daughter who's never been kissed.
Kyle Logan has been a sixteen-year-old bad boy for three years, ever since he became a vampire. After a stint at the rehab center run by the Brothers of Temperance, Kyle has finally kicked his blood addiction. Now, he's back in high school with one goal in mind: stay clean so that he can grow up and become an animal rights activist.
Cassandra Xander wants two things in tenth grade: a car and the chance to attend a traditional high school. She loved being homeschooled growing up, especially since her family moved every six months for Helsing Incorporated, but now that her mother is founding a slayer training academy in La Jolla, California, Cassandra is excited by the opportunity to attend La Jolla Cove High.
When Kyle witnesses Cassandra give a verbal reckoning to a dog owner who leaves her beagle locked in a sweltering car, Kyle makes his move. He loves that Cassandra is smart, intense, and willing to break rules. But Cassandra has zero experience dating and isn't sure that a relationship with a hot-tempered vampire is a good place to start--especially when she discovers Kyle's secret ability. Kyle works hard to master his emotions and make all of Cassandra's high school dreams come true. Just when their romance brightens both of their lives, Kyle's past draws him back into darkness. The only way forward for these high school sweethearts is to slay or pay. less