Hi. If I may I'd like to share some thoughts about what might be neat, and feel free to ignore these.
-For the avatar character, a top/bottom system that increases odds of a human/monmusu respectively. Doesn't need different animation, just to tweak the odds slightly, as well as enhancable breeding stats.
-For the Women/Monmusu, togglable messiness and inflation. I like the idea of the inflation lingering even if not having sex, but also being able to turn it off if you don't like it. Also, an animation like the monsters when giving birth with the avatar. The monsters have it so the monmusu could too.
-in general, if both parents have a Stat, it should have an increased chance of passing down. The idea of getting super-powered monsters is cool, but getting more than two stats on one Human/Monster is too RNG dependent. All in all, loving the game and looking forward to more! Thank you!