Hush, now forget. Sisters of Bloodcreek series / bk. 1
(Book)

No one will tell Eva and Frost the truth about the Blurred Ones. Not their hunter friend, and definitely not the parentals. Maybe it's because Frost spent time in a psychiatric ward and Eva never ceases to think with her hormones. So, when the girls see an opportunity to meet Albert Knox, the most infamous Blurred One of all, they lie about their true plans and head out on their field trip to San Antonio. When the sisters get to town, though, a ghost woman keeps attacking them in their hotel room, and they end up getting one of their classmates killed. Eva thinks she can use her feminine wiles to woo Knox, but he has a couple of more minions than they thought--and she ends up getting tossed through the window. If the sisters and their newfound hunter friends don't take down Knox soon, he'll permanently attach himself to Eva in a binding ritual.