I plan to add most of the relevant characters to the game, that includes enemies too, since I plan to give relevance to the combat (not the one that exists right now, I'm going to change it for another one), so yes, in the future. About the other question, I don't think so.
I dont know what you mean by this, its a porn game, so I guess so.
I'm going to give you a tip that will solve your life, forget about this game and come back in a few months, I'm not going to add a lot of sex scenes just for the sake of it, the game is only 5 months old, I plan to add a lot of content depending on what I feel the progress with the characters requires, everything is very green and premature for how long the game has been alive, once the events begin to progress enough, there will be practically only sex scenes. To be honest, Its even more difficult for me doing tease scenes than sex scenes, so as you can see I dont do it because I enjoy it, I do it because i want to give a logical progress to the game, even if it took me a lot more of effort.
If what you want is to see Naruto fuck all the kunoichis in that universe then maybe you can commission an artist to do it to your liking.
Everything that can be animated, will be animated.