Chaos Comes to Longbourn: A Pride and Prejudice Variation

While attempting to suppress his desire to dance with Elizabeth Bennet, Mr. Darcy flees the Netherfield ballroom only to stumble upon a half-dressed Lydia Bennet in the library.After being discovered with her in this compromising position, Darcy is forced to make her an offer of marriage.
A few weeks later, Bingley returns from London to discover that a heartbroken Jane has accepted an offer from Collins. Bingley instead proposes to Elizabeth, who accepts with the hope of reuniting him with Jane. 
Now Darcy must cope with jealousy toward Bingley and a fiancée who longs to get her hands on the grand estate of "Pembleton" (or is it"Peckersly?").  Lydia, in turn, is jealous that Wickham has proposed to Charlotte Lucas.
Although Darcy yearns for Elizabeth, he feels honor bound by his promise to Lydia.  Elizabeth has also developed feelings for the master of Pemberley, but he has never seemed so far out of her reach.  How can Darcy and Elizabeth unravel this tangle of misbegotten betrothals and reach their happily ever after?