my most persistent hc for mrm is mob says it first. he's older, he's more comfortable with himself/his emotions and he doesn't want to repress them anymore (even as reigen will try to stave them off lol). i think when reigen finally says it, it feels a lot bigger. he's felt it all along, but there's a gravity to it that only comes with more life experience. like "i know what's out there in the world. and it's always been you" kinda deal.

for gfsh, gojo definitely starts throwing that shit around immediately, but in the "love ya <3" sorta way, light-hearted, almost vapid, really. i honestly have a hard time imagining him actually saying it to megumi (with the whole "love is the most twisted curse" spiel, ya know?) even though he does love him. and if megumi ever says it, to me it would be during a really emotional moment between the two of them. so like, sex or death. obviously.