This turned out kind of reader-insert-y, but feel free to replace "you" with whoever you ship with said character or don't ship.
oso: is not really -into- the kink at first, he'd need his partner to talk him into it. but then once he learns that it's a thing (lbr, because oso is vanilla as fuck and doesn't know much about kinks other than like light bdsm), he's TOTALLY up for it. sitting around and stuffing his face? getting food and drinks for free? he'll fucking yeha. honestly the only thing stopping him from being a massive fatass is his 20something metabolism since he's like, canonically the type to get fat once he hits 30, but once he has a feeder he probably gets fat the fastest lol. also, au where he finds out that people online will pay you to just stuff your face on webcam and he gets 100% into it because pachinko money.
kara: probably the second least likely to get into it. he'd do anything his partner was into but he'd need convincing. his perfect fashion is expensive, after all! i headcanon that he has the smallest stomach capacity and gets stomachaches easily, so come prepared to give him belly rubs. obnoxiously painful, even when stuffed to the gills. be prepared for lines like "heh... under your dedicated hand, my body is blossoming into a truly enormous, exquisite flower...". kinda self conscious so prefers to eat in small restaurants or at home, until he really gets into it, in which case he'd love to have you set down a giant plate of fast food in front of him during said restaurant's rush hour and bathe in the stares. i've mentioned this before, but he's a total musclechub once he puts on weight. @god let me spoil karamatsu
choro: weighs himself obsessively and keeps a food diary. tries soooo hard to keep his little project secret from his brothers until someone (oso) finds his weight journal and mocks him obsessively. leaf him alone, you jerk! tends to push himself too far too fast at first, leading to Suffering on his part. i headcanon him as a fashion disaster, so please be prepared to go clothes shopping as you bulk him up, lest he end up looking like an overstuffed sausage. he needs a lot of encouraging because he tends to lose heart in his appearance easily. pamper the green bean.
ichi: actively looking for a feeder at the moment, lol. is totally up for being stepped on and called a fatass, or crushing you under his belly while you call him ichimatsu-sama. what else are you into. he's up for it. will push himself really damn hard to the point where he almost (or actually) pukes, but doesn't mind cuz he's into pain and lowkey into emeto. his Weakness is having his sides rubbed after a stuffing session and being praised and called an adorable chubby kitty, but you have to do this after he gets used to you, otherwise prepare to have your face clawed off. body worship and being called a good boy makes him literally melt. measures his growth in how many kittens can sleep on his tummy.
(also has cute lil/big moobs that are VERY sensitive.)
jyushi: definitely a feeder, not a feedee, but can inhale a staggering amount of food if you want him to. basically immune to stomachaches or feeling gross after a big stuffing. has a very ticklish tummy and a weakness for curry rice and ramen!
(i love juicy but i'm bad at wg headcanons for him, sorry lol)
totty: the least likely to want to do it! he spends all this time at the gym and you want him to turn into a piggy? come on- wait, unlimited sweets? being a "marshmallow boy"? ...what was this called again? feedism? w-well, maybe he'll listen to what you have to say. Does a total 180 in his eating habits, switching from a soy nonfat latte to the biggest, sweetest frappuccino sutabaa has to offer. surprise him with sweets and he will be Yours Forever. i headcanon that he considers himself a foodie, so he'll take you to all the cutest places in akatsuka ward so you can watch him stuff his face- don't be surprised if you end up getting a little chubby alongside him!
