Like this one's sorta loaded and kinda of a gray area for the rape category in my opinion...Like if it's forcefed turned dub-con (dubious consent) and agreement is reached by both parties after, it's still a violation of rights...but since this is 'technically' a fetish and if a FA/FE/FR fetishist did the forced stuffing, I think it turns the whole ordeal sexually exploitive in my opinion and more into sexual assault...if a non fetishist or fetishist from another kink did it, I think it just falls under 'assault by burger' (sorry if the joke offended anyone, not my intent).
Like, in a hospital setting where the person is not eating but needs to to live is a medical procedure. Cramming food down a person's throat in a sexual context I'd say yes. But consent and context are really important, and with art a person can write the dialogue with to their needs. So, I dunno.
Considering the fetish behind it, it would be if you did it to someone who actually really doesn't want it outside of a fantasy setting with prior consent. If there is no fetish or erotic sense behind it, then it's considered torture.
Well, if it's the same as the type of dialogue in a Hentai where the female lover goes "yamete" while having sex with their lover, then no, it isn't that. But if it's someone forcefeeding someone who actually doesn't want it as shown by them trying to seriously -not playfully- pull back said someones hands, then yes, it absolutely is that.