Immediately after his hand hits, Lucas regrets it. He hates that he feels that weakness, but he does, and it makes him lean down with a wince and press his forehead to the side of Liam's even as his hand draws up, his thumb caressing the deep indentations of his bite. He breathes there for a moment to try to gather back together his strength and then begins to choke him again, rocking back with a slow rhythm.