oh i do have a lot of ships where the older one tops! for instance mo du/silent reading is my bible and the work that pushed me into danmei in the first place, and the gong is older than the shou by around seven years.

for me it's more like...i'd automatically be more interested in any given work when it's marketed as gekokujou-flavored (not necessarily younger/older but also lower ranking/higher ranking, etc.) even without knowing anything else about the work, whereas marketing any given work as featuring older top/younger bottom wouldn't appeal to me in the same way.

also i have this thing where in some cases the opposite of my preferred dynamic squicks me off pretty badly and that's also something i take into consideration. student/teacher? yes please, but teacher/student? no thank you lol

i don't read works featuring younger bottom/older tops exclusively either, it's just that a lot of specific tropes/characterization that i enjoy can be found in those works. i am but a simple ojisan with simple needs 🥺🥺🥺

for me he is a Wife but he is not a True Fufu Wife(TM) on account of him being a Neurotic Catholic.

True Fufu Wife(TM) has a sense of peculiarity to them. they twist their own morality; their logic is often known only them, following pathways that are a world onto itself. both people and rules bend to fit them. they flit among the masses as some sort of almost-whimsical outlier.

sunday has some fufu traits, but his catholicism inhibits the rest. catholicism restrains, and sunday restrains himself first and foremost. there is a sense of jaggedness to his neuroticism and obsessiveness that almost seems clumsy, because his control issues are startlingly obvious. his self-deprivation is also obvious for all to see, and that renders him and his motives less murky than True Fufu Wife(TM)'s might have been.

i keep saying that he is essentially an ayato expy, but their backstories are deliciously contrasting—ayato is as close to an agnostic as one can be in a land literally ruled by a god, whereas sunday twists himself into painful shapes in deference of a long-dead god. their core traits are extremely similar in ways that matter to my dick, but ayato actually has the space to harness his True Fufuness and sunday just... doesn't.