Ran is the best, she asks for if he got a stiffy by seeing yakumo and gave the best advice. I just remembered that yakumo's husband was a college professor when she was 18 so it means he was at least 7-10 years older than her so, im just assuming, she may accept yamato by time even with 12 years of diff. Also yakumo calls herself aunty, old lady just bc she is a widow bc normally 28 is so young.