“Won’t you devote your afternoon to it? You know I must be off tomorrow morning. We’ll take a walk, and you can thank me at your leisure.”
Selden is toying with Lily. He knows she should devote the afternoon to Percy Gryce - especially after skipping church only to have Gryce come upon the two of them socializing after church. But his ego can't resist dangling the opportunity of an afternoon with him, just to see which she will choose.