Thank you all three for your honesty both to the critics and to the defenders. I'll go through it point by point:
1) About "stealing". Yes, the animations are taken from Princess & Conquest. I'm not hiding this, and my goal is not to take credit for someone else's work. But this is not the final version it's just a "skeleton" of the game, so that you can evaluate the gameplay mechanics, not the quality of the adult scenes.
2) About "free". The mod is distributed for free. I don't make any money from other people's assets. As soon as I see that people are actually interested in the mod, I will completely redraw all the animations from scratch although I'll probably have to pay an artist, because I can write code, but drawing is not a talent God gave me.
3) About legal risks (thank you, NexusOfChaos). You are absolutely right. I remember the Pixelmon situation too. However, I'm hoping the developers of Princess & Conquest will see this for what it is a temporary tech-demo, not a competing product and will be understanding. If they reach out to me with any concerns, I will remove the assets immediately.
4) Why I did this. Because creating unique animations costs hundreds of hours of work or a large amount of money. I can't invest that into a project that no one needs. First checking the demand, then the investments. This is not an excuse, this is just indie-developer pragmatism.
In conclusion: you are all right in your own way. I ask only one thing please evaluate the mod as a concept, not as a finished product. Your comments have already helped me understand that people care about copyright and that's a good thing.