these two honestly don't have like. any dedicated skits together? which is a shame because they're so cute? they're often doing random stuff in the background of screenshots, which i think says a lot regardless of how subtle it is? todomatsu is consistently really nice to jyushimatsu, and jyushi is always his first choice when it comes to going to mixers. i think todomatsu gets to have his "big brother" moments with jyushimatsu, too. if you look, you'll notice they play a lot of games together.
thinking about them in high school, i think todomatsu clung to his brothers equally, but jyushimatsu was the most scary-looking and therefore the most effective bodyguard.
notable moments/skits:
season 1 episode 17 — jyushimatsu and surgery
drama cd volume 5