" Luca reached toward Cass’s face and she flinched. But he didn’t seem to notice. He was in his own world, in the grip of emotions Cass didn’t understand. Pain and fear and regret--all of it swirled behind his eyes.
His warm fingers brushed the side of her face. Cass felt hot all over.
“If anything happened to you, I’d never forgive myself,” he said, tracing his hand from her cheekbone to her chin.
“Luca,” she croaked out, trying to swim up through the haziness of her own confused feelings. “What--”
“Just please stay in the crowd,” Luca said. He bent close to her, and for a second Cass thought he was going to kiss her. Instead, he pulled a curling tendril of hair from the corner of her mouth. “Stay with your aunt. Don’t go anywhere alone.”
“But I don’t--”
“Just promise me.”
His urgency frightened Cass. She didn’t know what he was talking about; had he seen something at the exhibition? “I promise,” she said.
“Thank you.” Luca brushed his lips across her forehead. Then he took her hand and the two of them headed back to the main street. "

― Fiona Paul , Venom (Secrets of the Eternal Rose, #1)