Stone Champion: A Paranormal Protector Tale - Heart of Steel, #2

It was meant to be a joke - trying out a demon summoning spell from an ancient spell book. Callie didn't expect it to summon one demon, let alone four. Now she can't get rid of him. Grant Steel isn't sure what's worse - that Callie is a better Latin scholar than he is, or that he's forced to protect her. But when a family wedding looms and Callie needs a date, she has no choice but to make a deal with Grant.
If he pretends to be her fake fiancé for the wedding, she'll allow him to protect her. But Callie gets far more than she bargained for.