This was a moment of great joy for my Emperor Moths: male above, female below.
Technical details of how they couple are not important. Also, I don't know how they do it: indeed, I have only the most general notion of how humans do it, geschweige denn lepidoptera.
Anyway, they did the business, there are hundreds of fertile eggs all over the place, and the two progenitors have now gone to their well-earned rest. Quite a shag, all things considered.