Mary never did go out for lunch with Daisy and Will after watching them together. As hot as she felt watching them, she felt the exact opposite afterwards.
She was conflicted about her response she faked a sickness that night to avoid having to look her family in the eye.
Will didn't push it with Mary but he did notice a certain Jekyll and Hyde attitude develop with his mother. At times it was like it had always been, but other times Mary was withdrawn and moody.
Will noticed his mother peeping a couple more times over the next few weeks and decided to help his mother along with her...