Jacob and his wife had been going through some tough times, but he never thought he'd be tempted by another woman. Then again, he'd never really thought of his sister-in-law as "another woman". Perhaps that's how he wound up in this mess....
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I'm looking for a female co-author to play the part of the sister-in-law. (If you want to add a direct incest vibe, you can also play both sisters; otherwise Jacob's wife will be an ancillary character only.)
However this develops I'd subject to discussion. Is the sister-in-law a sweet innocent who stumbles into an affair? Or is she a scheming seductress who purposefully charms her brother-in-law into her bed? These and other details can be discussed via PM.
I look forward to hearing from you.