btw, with respect to multi-partner encounters, I think what anthaum did was basically feed the single-partner logic to a multi-NPC passage structure, and this was not going to work. They'll eventually need to separate the logic of multi-partner encounters so that they, in a respect, act as one, to simulate the fact that actual people coordinate during groupsex so that they don't end up literally fighting over someone. It's hard to simulate this when both NPCs are basically acting as if they're alone with the PC. You need them to cycle between acts as they do in single partner encounters (e.g. going from dual blowjob to a spitroast position. Trains would need to be further separated, with one described as waiting). Transitions need to be better structured to take account of both NPCs acting in agreement basically.
The other issue (incompattible acts happening simultaneously) is, I think, broader, since I have also encountered it with toys (e.g. someone cavalierly putting a rabbit in my pussy while fucking me), but I think if she wants to fix it, it's relatively easy (you just make each act conditional on a list of incompattible acts not occuring). Groupsex is more difficult to order imo (but I think the base system really fits it, and it could work very well if she worked on it --and added a few more in-game options for it, as well)