Lucy. What I want to say is ... don't mind my being engaged to Walter. It shan't interfere with his work for you. If you want a proof that it shan't ... it was I got Aunt Julia to ask you to take him.... Though he didn't know ... so don't tell him that.
Trebell. You weren't engaged then.
Lucy. I ... thought that we might be.
Trebell. [With cynical humour.] Which I'm not to tell him either?
Lucy. Oh, that wouldn't matter.
Trebell. [With decision.] I'll make sure you don't interfere.
Lucy. [Deliberately ... not to be treated as a child.] You couldn't, you know, if I wanted to.
Trebell. Why, is Walter a fool?
Lucy. He's very fond of me, if that's what you mean?
Trebell looks at her for the first time and changes his tone a little.