As Chimera said, I said that K&K were retconned into being stepsisters. I'm not sure what the point of that emphasis is, considering that's part of what I said already. As for M&M, well, sort of? I got it wrong on Mai fucking Miko while Miko sucks you off. The scene I'm talking about only has Mai fucking Steele while Miko sucks you off. The only direct sexual interactions (aside from the aforementioned sandwich) between the two are Mai groping Miko on the first line they're mentioned, and then after cumming in Steele, she sticks her hands up the pc's ass, brings her hand out covered in her own cum, and has Miko lick the cum off of them. The text straight up uses the word "incestuous" in this scene. After that, it is strongly implied through dialogue that Mai rides Miko's cock with enough regularity that she made Miko take Throbb. Here's the screenshots I took of these three things throughout the herm orgy event.
Perhaps worth noting, I'm talking specifically about the Trials in Tainted Space Miko and Mai, a pair of hermaphroditic foxmorph twins, who themselves are based on Miko and Mai, a pair of hermaphroditic foxmorph twins who engage in orgies and group sex together in CoC. I am not referring to the Miko and Mai of CoC2, though it's worth noting that the CoC2 pair have the Pussy Triangle sex scene, where Mai eats Miko out, Miko eats Champ out, and Champ eats Mai out.