On the other hand, he didn't get two of his limbs chopped off and end up thrown into a pit of lava a short time later, requiring him to spend the rest of his life in an armored suit. So maybe the incest was worth it?
That just activated a long supressed and forgotten part of gaming history. At one point in Final Fantasy XI, you could get a really powerful sword from a dragon. Someone once asked "Would you fuck your sister for a Ridill". Not everyone said no... I might be getting the phrasing of the question wrong since it was 10+ years ago. I tried googling but nothing came up.
I could be wrong, but I read someone else’s comment years ago that said the suit was like that on purpose and it was a way for the emperor to control him or something.
Anyway, that might not even be canon even if it’s in some book or game.
It's canon. The suit was purposefully made in a very flawed way, so that Vader would have a difficult time winning a battle against Sidious. Even in his crippled state, Vader was a major threat. Also, it's not entirely clear why it happens in-universe, but Vader's burnt body was supposed to heal over time, yet it never did - not until Luke brought back a spark of goodness in his heart.