Her Dreadful Will by Rebecca F. Kenney

Soleil is a mind-flex witch with the ability to shift a person’s will, altering motives and skewing impulses. Her teachers from the online Institute of Magic view her power with suspicion and fear, convinced that its very nature makes her evil. Determined to prove them wrong, Soleil commits to unselfishly helping her town’s citizens for an entire year, using her magic only for good. But the arrival of a mysterious tattooed male witch throws her worldview—and her heart—into chaos.
The new arrival, Achan, shows Soleil secret magicks that the Institute has willfully concealed, and tells her dark and dangerous truths about the reigning body of witches. Breaking magical laws with Achan is wickedly satisfying for Soleil, but the further they go together, the more danger they face from the Witchlords—who will stop at nothing to ensure their rules are enforced.