i have this hc that izumi used to cut leo's bangs because he doesn't trust him with putting sharp objects near his face, back when leo shut himself in, since they weren't famous idols yet, they would not be professionally styled for work and leo didn't care if they grew longer and uneven, so izumi would help him trim them during his sporadic visit(s), mostly in silence, leo would just let him
and that little ritual was still something they did while living together, leo's bangs would grow a few centimeters, not enough for the stylists to notice when they prepare for a performance (maybe, leo purposefully tells them to leave his face alone, now that he doesn't trust anyone else to touch him), but enough for izumi's eye to catch it and get to work