Loserson and Forever316 made the same rather interesting observation i the thread about Conflicted in the old forum (link in UCNT's post above) regarding the conversation between Coleen, Stuat's mom, and Leslie. That Coleen, by knowing about Stuart's bullying of Lewis and not seeming to be the least bit concerned about it, in a way is condoning it, and thus is revealing a rather cruel streak in her personality.
I can imagine that Leslie's visit to dinner in the Warren houshold will be rather exciting. Explaining her thoughts and feelings to Coleen is a great opportunity for Leslie to become more aware of her own desires related to humiliating and bullying Lewis, and Coleen may be an important accomplice for the two protagonists. I can imagine the three of them, relaxing at the dinner table, giggling and laughing while Stuart entertains them with stories about the creative ways he has bullied Lewis ...