Well, not for me. I assume that if people jerk off to my characters, it mean they read either a fanfiction or even a hentai of it (lucky bastard, being able to draw my character!) and let's be true, in most of them the character does not get with the same partner they have in the original story, and I may be weird there
, but for me I feel disgusted if a weird guy/an ugly guy/ or any other guy than my MC fuck my FMC, while there obscure characters who I do not mind, but the principal ones, yes.
Also, that not only apply to my story to be honest, once I know some character have a partner in the original, I can't read a fanfic with another partner for them. For exemple, I remember one that are well know,
I think it's "Goddess of Ice; Reborn as Naruto’s twin sister", this fanfic may be good, I don't know, just the simple fact that hinata get with someone else than naruto and probably get fucked too, make me put this on a blacklist for me.
Now on another note, if they respect the characters partner, then maybe I will take this as a compliment.
I know the feel, also that fanfic really sucks there's a lot of fanfics, especially Chinese, where the character have a relationship with Gwen Stacy.
if it's established well (it will not be) I dont mind, but generally there's always this feeling of they're cheating on their fated partner or something
I still don't like it, and it'll rarely be, they'll always begin in the classic when they're 12
they don't have the maturity to have a polyamorous relationship (if those harems can even be considered that) and no sane adult would approve them.
if it's in Marvel or DC, they're most likely already adults, so I don't care.
I was reading one that was happening after the Endgame and at the start of Wandavision, it wasn't the best but I liked the novelty (it's really rare for a novel to start after endgame) and I somewhat liked the relationship between Wanda and the MC.
until the MC fucked up a spell and Spider-Gwen jumped from a portal
I immediately dropped the novel, I didn't have to keep reading to know that the stupid fucking writer was going to make her a love interest.
and I saw the signs, he was talking about making a poll to see if the readers wanted a harem or more love interests or something
I didn't want to believe, how foolish I was...
I don't know, you can find Custom made demon king on webnovel, for the other I don't know if it there.
If you want, you can give a try to the site Ranobes.top it's an illegal site, but they put the link toward the original story, they got a good interface and the rating are good most of time, except when the story was new on the site.