No. Importantly, this is NOT a rejection romance. Caine never formally rejects Grace. Instead, it's a reluctant mates dynamic where both parties resist the bond for different reasons—Caine because she's human, Grace because he killed her pack.
The chapter describes Grace as "oblivious" with the fan blowing hair across her nose while she sleeps. This suggests she doesn't know about Caine's nocturnal visits, though she may suspect given his behavior changes.
Extremely. Chapter 37 ("Caine: You Touched Her") shows his violent reaction when anyone touches Grace. He also tracks her when she runs (Chapter 41), sneaks into her room (Chapter 221), and maintains constant surveillance.
Caine doesn't believe Grace belongs in his world. He considers her too fragile as a human and doesn't want to put her in danger. His cold, powerful demeanor masks the internal battle between his sense of duty and the mate bond pulling him toward her.
Grace considers Caine a serial killer and a madman. She is horrified by the scale of death he caused and initially views him with pure terror and hatred, unable to reconcile the violence with the mate bond she feels.
Though specific physical descriptions vary throughout, readers note that Caine is described as physically imposing—rippling muscles, heaving chest (Ch. 149), powerful presence. Grace internally acknowledges his attractiveness despite her fear.
The first contact likely occurs during Grace's kidnapping (Ch. 13) when Caine binds her with rope. This initial touch is violent and one-sided, contrasting dramatically with later consensual intimate moments.
Caine is caught lounging on Grace's bed, holding her pillow to his face and deeply sniffing it. This reveals his inability to resist her scent despite his cold exterior—the fated mate bond compelling him to seek out her scent even in private.
Grace wants to protect Ron's childhood; Caine wants to train his power. This disagreement reflects their fundamental difference—Grace values innocence and choice, Caine values preparedness and strength.
Yes, multiple times. Chapter 41 shows Caine tracking Grace after she's been gone for two days. Her attempts to flee are driven by her desire for freedom and her horror at being bonded to the man who killed her pack.