Damn. That's some dedication. I really like the personal story, therein. You don't always see that, in STEM stuff.

I hope that their relationship deals well with the new reality, now that their principal goal has been achieved.

I think experts in all kinds of fields should write more about their thinking process. Just showing final result often feels like it was easy for them and discourages other from even attempting to understand and contribute. Especially in mathematics, the ideas are simple (they have to be because no one would be summing infinite series in their head like Ramanujan) but they are hidden behind lot of symbolic jargons.