Book of Shadows written by Cate Tiernan

This is Book 1 in the series. Cal Blaire is the new senior guy at school. He is gorgeous. Cal is in a couple of Morgan's classes. Cal asks a few of the kids to join him in creating a circle to celebrate Moban. Morgan, Bree, Raven, Robbie, Chris and a few more are asked to join the circle. Over the course of a few weeks more circles are created. Morgan has an affinity for the circle magick. Cal notices that Morgan has this affinity. Bree drops Chris as a boyfriend wanting Cal as her new boyfriend. But Cal in his way keeps Bree at a distance. Morgan's parent have raised Morgan to be Catholic and demands she have nothing to do with Wicca, witches and covens. Morgan likes Cal wants him as a boyfriend but Morgan is a good friend and tells Bree to go for Cal as a boyfriend. As time passes Bree accuses Morgan of taking Cal and their friend hits a difficult time.
Everyone realizes that Morgan has an affinity for magick. Once Morgan acknowledged her affinity as a blood witch she didn't question what it meant for her and Cal to be together.

Book 2 is The Coven