The second couple is my fave couple ever. They basically raised the top from the main couple together so it's obvious. Not to forget how much san acts like their kid, in the newest chp especially he's complaining to sun about wanting an allowance while sun is like why would I do that? Do I look like your dad? in the background and 704 is just standing beside them fully ignoring them like the mom he is. There are instances where even yama is hinting towards sun and 704 being san's
I didn't like what the top from the second couple tried to do with the bottom from the main couple (who is supposed to be his child) but it was okay ig everything turned out fine at the end.
Fate Makes No Mistakes