Were they lovers? Owen Barfield, who knew Jack well in the 1920s, once said that he thought the likelihood was "fifty-fifty". Although she was twenty-six years older than Jack, she was still a handsome woman, and he was certainly infatuated with her. But it seems very odd, if they were lovers, that he would call her "mother". We know, too, that they did not share the same bedroom. It seems most likely that he was bound to her by the promise he had given to Paddy and that his promise was reinforced by his love for her as his second mother. 
God "became a man" in Christ, Lewis says, so that mankind could be "amalgamated with God's nature" and make full atonement possible. Lewis offers several analogies to explain this abstract concept: that of Jesus "paying the penalty" for a crime, "paying a debt," or helping humanity out of a hole. His main point, however, is that redemption is so incomprehensible that it cannot be fully appreciated, and he attempts to explain that the method by which God atones for the sins of humanity is not nearly as important as the fact that he does so.