OH i like both those ideas actually, both hooking up before they knew who the other was and also the hilarious awkwardness of the future hookup where his son catches her leaving! we could say they met at a bar the good old fashioned way since she isn't particularly active on tinder, maybe it was just a couple of weeks before the parent-teacher conference and it took both of them a minute to work out why the hell they looked so familiar? for the future hookup, it'd be hilarious if his son said something in front of the class the next day so she can text him while she dies of embarrassment 😈