I think it would be nifty if you had a personality option, or catamite levels. They would change the dialogue more and more favorably. Starting with zero, all the text is rather nonconcentual, one is reluctant/denying, two is somewhat enjoying themselves, and three is outright enjoyment/slutty. You also have the option of using a stat check, like oral enthusiast talks more favorably during oral scenes alone, or cum drinker has your character savoring it instead of being grossed out all the time. I also feel like it wouldn't be much work on the team anyway since most encounters have some sort of stat check, just add another one, and initially it doesnt even need art.
My next idea would be a dating mode/dynamic, instead of everybody fighting, with each encounter everyone has more enjoyable sex. First time you meet the harpy she dive bombs you, the second you catch her hunting, the third she's nesting and eventually you can have a "good end" the main thing that gives me this idea, is the whole bad end thing that already exists for this game, if you could turn encounters positive or in your favor, why not end positively.
Then I kinda want a better topping setup. I know the game is somewhat punishment oriented, but I'd still like to see some more positive or dominant situations, like the dullahan, or minotaur.