Ex-Wife's Return

After my divorce, things settled into a comfortable routine with Sarah. We had dinner once a week, split custody neatly over weekends. But last night, she showed up unannounced and pulled me into the bedroom, insisting we 'revisit some old territory.' I found myself caught between amusement at her boldness and skepticism about this sudden spark. Is it normal to feel both intrigued yet wary? Should I just roll with it or suggest we stick to our usual boundaries?