Not many things really attracted Kol, very little could appease him, but Madalyn left him with many unanswered questions.
Why didn't she freak out over the original text for Niklaus?
Who is she?
He had a thirst he couldn't quench and it was only a single conversation. He was drawn to her like gravity, constantly feeling the pull.
He was confused, and this confusion made him angry, but at the same time fulfilled, he couldn't explain it. Though he did know he needed more and more he would get.