The way Dad said it, it sounded like he wasn't going to cheat on Mum. Which was good. Very good. But wait-- "Dad, it's definitely not serious. I'm keeping my options open. I don't need a girlfriend right now. Just want to have some fun. I don't have any idea what comes next out there in the real world, although I hope it involves discovering new cures that amaze the wizarding world."
He frowned then, because he realized that he knew Mum and Dad in his now, but their now was very different. Did they end up where they thought they would? "Do you think we'll be here years?"