It's more likely Balthazar would just get scolded, or teased, but he's content with her suggestion. He throws himself into the kiss, holding her tight and putting forth all of his considerable physical energy into leaving her giddy and breathless.

He's not actually sure what they've got here, but he's enjoying it.

When the kiss breaks, he keeps his arms around her for a moment. "Perhaps we'll have a better chance to carry on later."