"fetishizing his position as a butler"——yes, that, this, everything about this, absolutely.

yuzuru has this thing where he tends to, like, 'offer himself' to others that he decides he will trust and will probably live the rest of his life devoting himself to unless Something Happens and he, of course, Stops. one thing about him i've noticed is that as soon as he fancies someone enough, and if that trust or that feeling builds further and further until it reaches a certain point, then he [will] take every chance to offer all of his services to them.

i think about what yuzuru said to eichi in circus a lot ("from the moment i was placed in fine, my life belonged to you. please use it to your heart's content, as the foundation for your military rule.") and i KNOW that he prefaces it with "from the moment i was placed in fine" which i guess could maybe serve as an indicator that it's only like that because that's just how it should be; because he's a member of fine and eichi is The Leader of fine so "it only makes sense," but i feel like offering something as valuable as his [life] isn't something he would do so lightly to just [anyone] just because they happen to assume a leader position. yuzuru has never in his life been reluctant to setting his boundaries even as a person assuming the role of one who might be "lesser than others"; it took him some time to get comfortable to [really] enthusiastically accept eichi as someone who he would pay no mind devoting himself and his services to.

and i know he kinda does service others he's not too familiar with as well but obviously i think there's much thicker of a barrier that lies there between them and himself so it's not like he'll let just ANYONE fuck him if they asked him to let it happen. or vice versa. it's just typical butler etiquette, really. and also he really likes doing things because he [needs] to lest he feels miserable and restless, so if someone could get him to get moving, that'd be awesome for his psychological wellbeing.

ANYWAY... sorry. i actually don't know why i said this much, i feel like i definitely started treading a different path there for a bit, but. i really just wanted to put a lot of emphasis on yuzuru and his boundaries as someone who is a butler and how they work so that i don't sound TOO insane for suggesting that he could 'offer himself (his body)' to wataei for stuff like sex, um. basically he only does those things if he wants to and he trusts them enough. so there's absolutely nothing dubious about it. i'm just playing into that thing you said about yuzuru letting himself "lose himself" to a submissive role...

(this could probably act as a tl;dr) i feel like the concept of butlers who will do anything for you CAN and HAS been sexualized a lot in the past so it's definitely not farfetched to think that yuzuru could absolutely work with something like that. he could grant others (cough wataei) sexual favors if he found that he really wished to, and bringing pleasure to others that he likes, in turn, brings him satisfaction. because "taking care of others" is another one of his specialities and something else that he REALLY likes doing.

so yeah. submissive butler yuzuru. it can work really fucking well

sorry. i was so enamored by what you said about yuzuru at the end of your last response there that i ended up really focusing on him in this. i hope you enjoy my research paper on fushimi yuzuru's submissive role in sex as someone who also happens to be born a butler