Christina Kelly says her investment-banker husband made her go the extra mile to help him land a client — pushing her into a partner-swap with the business honcho and his wild girlfriend. The mom of two revealed details of the kinky alleged hookup — and every drug binge, extramarital pool fling and sex encounter in between — in salacious Manhattan court papers targeting her husband, Jefferies & Co. wunderkind Sage Kelly. And now, she and her reputed real-life “Wolf of Wall Street’’ hubby are “the talk of the town,’’ a Wall Street source said. “All the top Wall Street and hedge-fund guys are talking about it. They are ... (full story)