The Viscount Who Loves Me by Julia Quinn (The Bridgertons #2)
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She is also sweet, innocent and eminently biddable - Anthony is sure she'll make a perfectly acceptable wife and vows to make her his. The only obstacle in his way is Edwina's older sister, Kate. Kate is determined to do all she can to allow her sister the chance to marry for love rather than convenience.
And the roguish viscount is beginning to think he may have met his match in Kate's keen wit and sharp tongue. Until, that is, he makes the mistake of kissing her...