Beth. Nine-Teen Tales, #6

Mike gets stucks with one more final job of the day at the stadium fixing a faulty firework mechanism but he needs help to fix it and of the available people left to help - Beth is the only one not afraid of heights. So once they get to the serenity of the roof and Beth laments not having a boyfriend who would want to take advantage of the crazy sex location - Mike and Beth cross the boundaries of work colleagues ...
not one ... but twice in the same day.  And Beth continues to surprise Mike at every turn and every thrust.