The Twilight Saga (when did it become a saga instead of a series?) is pretty chaste up until Breaking Dawn, but maybe mom says you're still too young to read about Bella and Edward - so what's a reader who loves the supernatural to do? Here's a few books that might satisfy kids and parents:
Cirque du Freak by Darren Shan- scary, funny, no mushy stuff
Dakside series by Tom Becker - visit the hidden and terrifying side of London in this boy-friendly series
Heck: Where the Bad Kids Go by Dale Bassye - siblings die in a marshmallow explosion and try to escape an otherworldy reform school, also try the sequel
Chronicles of Vladimir Tod (series) by Heather Brewer - funny, gross, books grow-up along with Vlad
The Crossroads and The Hanging Hill by Chris Grabenstein - ghosts and scares abound
The Silver Kiss by Annette Curtis Klaus - from way back in 1990, but still swooningly romantic and tragic
Dead is the New Black by Marlene Perez - first boyfriends and vampire cheerleaders?!
Vampire High by Douglas Rees - failing student, Cody, chooses Vlad Dracul Magnet School instead of Our Lady of Perpetual Homework - hilarity ensues.
A Taste for Red by Lewis Harris - Svetlana searches for missing classmates and vampires
Vampire Island by Adele Griffin - life in Manhattan as fruit bat-vampire hybrids