Stone Shadow: A Paranormal Protector Tale - Heart of Steel, #4

Octavia has always lived in her sister's shadow. A perpetual student, she's this close to fulfilling her dream - a VR world that brings history to life. Until a freak accident destroys all her work and sends her back to square one. Harlow has spent half his life paying for his brother's mistakes. Enough is enough. He's not going to help Grant this time. Instead, he's going to keep a lady scholar company, and to hell with whatever Grant wants.
Until he discovers Grant may hold the secret to breaking both Harlow and Octavia free from the spell binding them.