Flag description was good. At least it should be good enough for most of those readers who are vague on the subject.
MC is good, weirdly enough. He's gotten a fixation (too rich and too sheltered upbringing, and the Maid went along with him to begin with, but many pubertal boys of lesser means have spent as much time with more surreptitiousness to sneak peeks on panties. MC just walks up bold as brass and asks to see them, and definitely can't condone of any sneaking or false flags.