April Lady

33 At just this moment, X turned to mount the few steps to his door, and uttered a joyful exclamation. "Y! Oh how glad I am to have caught you!" The jarvey, observing that the expression on Y's face was of profound dismay, clicked his tongue disapprovingly. In his view, X - as dimber a mort as he had clapped eyes on in a twelvemonth - was worthy of a warmer greeting than the startled: "Good God!" which broke from Y. Who are X and Y and why is X glad to have found Y?: X = Lady Helen (Nell) Irvine Y = Mr Felix Hethersett.
Nell was looking for her husband's half-sister's unofficial fiancé, because she feared Mr. Allandale had been lured in to an elopement by the irrepresible Letty (the half-sister). Nell was thrilled to find Felix at home because although she was in the correct street she did not know Mr Allandale's exact address.

61 "But ___," she stammered. "The cases are not comparable! Perhaps it was wrong of me--indeed, I know it was wrong!---but it was not---it was not wicked!" "Oh stop acting the dunce!", he said exasperated. "Of all the fustian nonsense I ever heard in my life--! What the devil's come over you, ___? You were never used to raise such a breeze for nothing at all.": Lady Helen (Nell) talking to her husband, The Earl of Cardross - he thinks she has sold the Cardross jewels and she thinks that he is talking about her gambling on horses!

121 "...one might as well try to milk a pigeon as set about helping a female out of a fix!": Dysart talking about his sister Nell's reaction to his holding up of her her carriage to help her out of a fix

135 Two different books, same sentiment... "I wish you will tell me how you contrive to look more beautiful every time I see you?" "How do you contrive, ---, always to appear prettier than I remembered you?": Giles Merion, Earl of Cardross talking to his wife, Nell
See also Cousin Kate (Mr Phillip Broome)

178 "He had once struggled to support her through several rubbers of whist, an experience which had left him in doubt of her ability to distinguish spades from clubs.": Felix Hethersett thinking about Lady Helen (Nell) Cardross

185 "For the lord's sake, X, go and dip your head in a bucket!" said Y.: Felix Hethersett talking to Dysart (Nell's brother) after Dysart has "objected" to Felix's attentions to Nell

195 "Will you be warm enough, do you think, with only that shawl?" "No, I daresay I shan't be," _______ replied candidly, "but it is so dowdy to wear a pelisse!": Lady Helen (Nell) talking to her sister-in-law Letty

224 "If he thinks my ribbons insipid I am astonished that he hadn't the effrontery to say that your dress was commonplace! Depend upon it, he thinks you would look more becomingly in purple, or puce, or scarlet! Odious creature!": Letty is exclaiming to Lady Helen (Nell) Cardross about a comment made by Felix Hethersett

237 He was just about to refute with considerable indignation the suggestion that he was a tale bearer when providence intervened.: Felix Hethersett speaking to Lady Helen (Nell) Cardross

276 X was thrown into disorder. It was not that he particularly feared Y's fists, both of which were suggestively clenched; but that, in face of that fiery young man's quick wrath, the horrid suspicion asssailed him that he had been doing him an injustice. This was a breach of ton the very thought of which made him turn pale.: Felix Hethersett (X) is afraid he has done an injustice to Dysart (Y)