Of all the things to maybe not do in order to calm a vampire and get her to stop wanting you, baring your neck had to be at the bottom of the list. Harry wasn't making a very good argument for stopping.
This isn't real.
She heard him, but she sort of ignored it. Because it was interrupting the attention she was paying to his neck.
He'd said 'we can't.' That gave her a slight pause. There was a reason, wasn't there? For a brief second, she remembered Lindsey, but then that was gone again.