What does Holden do to Mrs. Morrow throughout chapter 8?

In chapter 8, Holden meets Mrs. Morrow on the train to New York. He likes her and finds her attractive, so to please her, he tells her a string of lies about her son, Ernest. To us, the readers, he tells the truth about Ernest:

Her son was doubtless the biggest bastard that ever went to Pencey, in the whole crumby history of the school. He was always going down the corridor, after he'd had a shower, snapping his soggy old wet towel at people's asses. That's exactly the kind of a guy he was.

But knowing that parents like to hear good things about their children, he tells her:

He's one of the most popular boys at Pencey.

He also tells her that Ernest should have been class president but was too modest to run.
Holden, who tells her his name is Rudolf Schmidt, has a complex set of reasons for lying to Mrs. Morrow. Although she is much older, he indicates that he is attracted to her, though he denies being "oversexed." He is just "sexy," he says. So in part, he is flirting with her, wanting to make her feel good. He even offers to buy her a cocktail.
On another level, however, Holden is simply being who he is, a person who wants, overly much, to protect other people from unpleasant realities. He means well, at least on one level, but is not particularly mature in his behavior. We see too that he enjoys weaving stories, and, like many adolescents, he is in the process of trying on different identities.

In chapter 8, Holden boards a train heading to New York City and ends up sitting next to a woman named Mrs. Morrow. Mrs. Morrow notices a Pencey Prep sticker on Holden's luggage and asks if he knows her son, Ernest Morrow. Holden says he knows Ernest and introduces himself as Rudolf Schmidt. Holden proceeds to lie to Mrs. Morrow about her son and continues to tell her outrageous lies concerning himself and his situation throughout the trip. Holden tells Mrs. Morrow that her son is a popular, sensitive boy who was too humble to run for class president. Holden takes pleasure in lying to Mrs. Morrow the entire trip and enjoys seeing her smile when he makes up stories about her son's accomplishments and popularity. Holden even tells Mrs. Morrow that he is leaving Pencey Prep early because he is having a small tumor in his head surgically removed. Holden's interaction with Mrs. Morrow characterizes him as a liar and reveals that he is an unreliable narrator.