The offer to leave something in her mind (even something as simple as a phone number) is a bit alarming. How can he sound so casual about it? Is it something he's learned to do in the dreaming, or something he can do all the time? She hesitates as she tries to think of a polite way to refuse.

"I'm sure you don't owe me anything," Which is true enough (and anyway, it'd be a small favor she'd earned with what little assistance she'd given him). "And I'd rather you didn't put anything in my mind. Maybe I could just give you my number?" Then he could text her instead of mucking around in her head.