The one he loves to hate

Lex had always hated Keith. Keith had always hated Lex. They were archenemies. Lex wanted nothing to do with her but one night of foolishness changed everything. Now Lex found himself shocked with the news that he fathered Keith's baby. What would Lex do? How would Keith accept the fact that Lex -- the man she hates with all her heart will be a part of her life for a very long time?