A clever and fun story, just the sort of inventive time travel I like best. Dudley and Millicent make an excellent couple; I think their characterizations work very well.
Their first time was sweaty, fumbling and rather short. But as they lay side by side they both agreed that it had been a) literally fucking brilliant, b) they had much to learn about this, c) more practice would help immensely and finally d) that they didn’t have any pressing matters right now, so the additional practice should start right now.