I dont think it (Cathrine fucking a man or a femboy) is going to win any polls because most of the patreons have sub tendencies and they will vote for something else that will make Cathrine be a sub.
Anyway, the game is already for a narrow odience, somewhat. Two biggest reasons:
First: it has a fem protag, and many players dont like this because they want to play the character like themselves, instead of putting themselves in the character that they play.
Second: It has futa. It usually is not liked by the previews odience that I mentioned and it also doesnt attract lesbians that much.
Putting a scene with Futa Cathrine fucking a guy wont change much, imo. But damn do I want a Futa MC protag game that fucks men and women. Most futa on male game I've seen are from the males perspective and I'm not into that because they always act as subs and the fact that I dont care about most male protag games. They are so generic.