It's too subjective a concept. Kirito and Suguha are cousins. In Japan, where Fujino now lives, such relationships and marriages are allowed. But they are prohibited in mainland China, but they are allowed in Hong Kong and Macau. Does Fujino consider their relationship to be incest at all? In my country, for example, this is allowed, so for me, Kirito and Suguha's relationship is not incest at all. And if I say, "This is not incest," I'll be right. And before shouting "incest is bad," it's always worth clarifying - "this is my subjective opinion."
This is not a claim against you, brother
AlterInfernalAllius, you're just right, it's annoying when people think that Kirito and Suguha can't be together, just because it's incest.
Incest content is prohibited on Patreon, and judging by the fact that Kirito and Suguha's addresses to each other are not edited in Fujino's game, Patreon also believes that there is no incest in this game.