If you did this:
then you won't get it I'm afraid (I don't know folks' kinks so I set that one default). I will add that as a cheat button in an update. Until then, so you don't have to import a Ch1 file or start over with manual stat settings just drop the attached in the "SanchoMod" folder and it'll be set for some DoubleTwin action when loading a save (it won't work starting from scratch unless you save that scratch start then re-load it). If you don't want them together then simply remove/delete the file. Feel free to rename the file dropping the "1901349_" prefix.
I thought I followed your instructions, but it didn't seem to work out. As for "doing it with hot twins at the same time" - I think every heterosexual male has that kink, and we wouldn't even call it incest since a penis isn't entering an orifice of a relative of the first or second order.
I'm including some shots of stats/settings, etc. to show you where I started, what things were set to so maybe you can identify where I may have gone wrong.
I opened a ported instance (first pic) from the Ch1 list (none of which was played with an Ipatch, so that could be part of it, and I did get the twin doubleteam at the festival). Once I "started" with one of these, I made sure the settings were using the Ipatch, and that the "twinsnosex" was "false", saved the game, exited, then reloaded.
It isn't like the world will end if I didn't get twin-on-twin this time, but I'm just curious why it didn't work. Maybe I have to replay Ch1 patched or something. Or maybe I don't have the proper version (though I thought it was the most recent upload here).
Thanks for any insight.