I don't condone RL incest. My reaction to fanfic incest depends a lot on the pairing and the scenario.
In general, parent/child incest disturbs me a lot because of the power imbalance. The exception to me would be Malfoycest because I'm used enough to the fanon tradition, and because the characters seemed messed up enough that incest would be the least of their problems. I've written inlaw incest between Pansy and both elder Malfoys, and found it more of a frisson than a squick because all parties were adult and consenting.
Sibling incest, especially of the Fred/George variety, doesn't trouble me as much because I see them more as equals. This would depend a lot also on their relative ages. While I probably wouldn't be too interested/turned on by a Bill/Ron fic, I could probably take it or leave it if they were both adults. If Ron were underaged, it would be a definite squick.Bill/Charley would bother me much less. I'm currently writing a Sirius/Regulus fic, and again it's consensual, the two are roughly the same age, and they're already screwed up so it feels in character.
Sirius/Harry used to squick me deeply until OotP. I saw them as having much more of a father/son dynamic in GoF, with Sirius as the parental advisor figure and Harry as the juvenile who looked up to him. I couldn't bear the thought of Sirry in that context. With OotP, Sirius is on a closer social and emotional level with Harry, and Harry is, let's face it, checking Sirius out on a regular basis. While I don't think it's intentional, there's enough of a canonical UST vibe to now make me feel that Harry/Sirius is a highly believable pairing, with just a frisson of incestuous overtone to add spark to it. The fact that they're godfather/godson still gives it a "forbidden fruit" feeling to it, but they feel like equals to me.
While it's not incest, I have a similar feeling with Snape/Harry: they're not equals strictly speaking, but they have so many emotional problems and similarities that they feel much more on the same level to me than, say, Snape/Hermione. Which *would* squick me, because Hermione feels like a student, pure and simple, and Snape, with Hermione, feels very much the teacher in charge.
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In general, parent/child incest disturbs me a lot because of the power imbalance. The exception to me would be Malfoycest because I'm used enough to the fanon tradition, and because the characters seemed messed up enough that incest would be the least of their problems. I've written inlaw incest between Pansy and both elder Malfoys, and found it more of a frisson than a squick because all parties were adult and consenting.
Sibling incest, especially of the Fred/George variety, doesn't trouble me as much because I see them more as equals. This would depend a lot also on their relative ages. While I probably wouldn't be too interested/turned on by a Bill/Ron fic, I could probably take it or leave it if they were both adults. If Ron were underaged, it would be a definite squick.Bill/Charley would bother me much less. I'm currently writing a Sirius/Regulus fic, and again it's consensual, the two are roughly the same age, and they're already screwed up so it feels in character.
Sirius/Harry used to squick me deeply until OotP. I saw them as having much more of a father/son dynamic in GoF, with Sirius as the parental advisor figure and Harry as the juvenile who looked up to him. I couldn't bear the thought of Sirry in that context. With OotP, Sirius is on a closer social and emotional level with Harry, and Harry is, let's face it, checking Sirius out on a regular basis. While I don't think it's intentional, there's enough of a canonical UST vibe to now make me feel that Harry/Sirius is a highly believable pairing, with just a frisson of incestuous overtone to add spark to it. The fact that they're godfather/godson still gives it a "forbidden fruit" feeling to it, but they feel like equals to me.
While it's not incest, I have a similar feeling with Snape/Harry: they're not equals strictly speaking, but they have so many emotional problems and similarities that they feel much more on the same level to me than, say, Snape/Hermione. Which *would* squick me, because Hermione feels like a student, pure and simple, and Snape, with Hermione, feels very much the teacher in charge.
Does that make sense?