In the future, will there be anything between Catherine and Cassius?
I think you are the first to suggest it.
But indeed, if e.g. Katherine surprises Myriam with Cassius, but without saying anything, there could be an option/choice to open Katherine to the bestiality kink or not (same way as it was done for the massage in the pool), so players can decide to avoid that happening or not.
Or if Myriam kind of teaches Katherine about "stuff of life", it could be in that context - if I remember well, Patreon said no sexual situations between Myriam and Katherine (which if I remember well Zorlun had anyway never considered), did not forbid from having Myriam somehow showing sexual stuff to Katherine.
Effectively, it is not even needeed a direct voluntary showing, it was was suggested (effectively, even by me) it's enough someone else (Marc ? It's his style) makes a video catching Myriam in the act (or pushing Myriam to do that), depending on their relation, and Katherine sees it after. Or Myriam showing Jennifer, and then Jennifer separately showing Katherine (those sexual interactions are not udner the Patreon forbidding rules).
But honestly, I think Zorlun will simply say "never foreseen, and it's not going to happen"
, for a number of reasons.