Well, for starters, I will say that the reactions are sometimes inconsistent to their Affection/Fear levels so there could be more work put into that.
You could do a lot more with the boobs, you could tongue the girls, same with the ass, and I don't even know at this point why the thighs option exist as a separate entity...
And, of course, some extra dialogue on any interaction would make it better as well.
Reactions have to be programmed in, every branch creates a pair of options. Is corruption is over a certain amount, or below. Each trait/attribute compared requires additional lines of code. This is just a hobby for me. If you are paying the bills, I'm doing whatever you think is necessary. Since this is a hobby, I'll put in only as much time as I feel is appropriate. I've worked really hard on what I build, sometimes it's not quite what I wanted it to be, but it works, and all of it has taught me about the renpy language I'm learning about.
Making more actions means making more .webm's, and making them means watching a lot of porn. A lot. For the analingus, I think I watched about five hours of porn, just scanning through trying to find useful stuff. I included four vids, all the best I had finished before getting tired of watching porn. You can only watch so much of it before you just want to do something else. And a lot of it is stuff I'm not terribly interested in. Some people are into legs, like, really into legs. The vids showing guys blowing loads on them is proof of that. Might not be your thing, that's fine. Don't use it.
As to adding more dialogue, again, I'm not a professional writer. I have precisely zero fictional works in my portfolio. I'm an editor, mostly technical/user manuals that most people will never read (admit it, you've never read your phone's user manual). You can, however, freely edit anything in your game. That includes files I've made, it's not like there's some kind of copyright-protection program guarding them from modification. If you want the girls to say something else, do it. They'll say anything you want. I just don't have any idea what you, or anybody else, would want them to say. Modifying existing files is how I learned to create renpy files. If you need a hand learning how to identify text in the scripts, or how to add additional checks, I'm always willing to try to help.
And, I'm also perfectly willing to make new actions, I just don't really know what else could be needed, or desired. I added some that I wanted (titty-fucking and cumming on boobs/pussy/ass), and the analingus for a buddy with restrictive-access to the web, I added the legs-option since I thought that area just needed another option. Maybe I'm just an old stink-in-the-mud, but I don't know what other interactions could be used.
I find it's a bit overloading now at times, and tend to use only a portion of the available actions as it is. If there is a specific action you want to see, name it. It just has to be something that can fit into the existing structure, so face, chest, ass, pussy or legs. I'm mission-oriented, so the more clarity I have on something, the better. The 'heart-to-heart' project is slow-going, as it's difficult to imagine how conversations like this would go, and the attribute changes need to be kept balanced. I also don't want it to be overused, so I'm looking at ways to restrict it, either by time, or figuring out how to make it a once-a-day option like some of the other interactions with mom. I'm working on the latter, since it teaches me something new.