You can't really have a size diff throuple cause one of them has to be medium
@dragon but have you considered:
size diff couple with Big, Small, and then Wide
if big is 6"2' then wide is 6"6 across but only 4'2' tall
@dragon yeah you can, you just repeatedly emphasise the bigness of the tallest one and the tininess of the shortest one
then the gal in the middle gets to be the small one and the tall one depending on context and i think that's beautiful 