[She's silent during his explanation, looking again at the mark with great interest. When he's done...] You do have a rather singular gift. Do you know how fortunate you are? This key can open doors, yes, both physical and metaphorical. I see now what is to interest me about you.

[And what interests her now, apart from the fact he is from her future.

Meanwhile, she looks at him with a frown.] As long as that is clear to the both of us.