I have opinions about this second part. The animation is fine, but since the story is linear and you can't change it, for example, the avoidable NTR to choose between two paths (100% vanilla good ending), (100% NTR ending), (50/50 ending)
I say this because I feel like you're walking a fine line between a good ending and an unreal ending. The game gives you that feeling. With Darkness, you have options regarding Aqua. You're so close to being able to do what I'm suggesting that it would be a shame if it couldn't be done.
Maybe it would be good to set up a Discord for the community and votes that have less impact than Patreon's, but to find out what the community would like.
Because I feel like it's missing something, and I think it's the ability to choose within the game's story whether Kazuma wants to do different things or not, so that it's not similar to other games of the same genre.
As I said, if necessary, it can take three months to add a vanilla route for Part 1 and Part 2 so you don't have any issues afterward. If the community agrees, then NTR can be avoided.
Because in different forums I saw that they like your game but it seems that they are also looking for it to be an avoidable NTR, something that has 2 or 3 endings.
or a single total ending, the NTR doesn't have to change the girls' perspective but I don't think Megumin would like to find out that Kazuma did it with another girl although if she were her she would probably forgive him. That's why I say 2 or 3 endings in case the character's actions change the future
While the personalities are swapped because it's a game, Darkness, even though it may not seem like it, has dignity and knows where to stop her masochism. That could be an example to avoid. Or have an external character, Kazuma Aqua Megumin, help her. Aqua is also dumb, but she won't let herself be touched. By simply setting two options for when things happen, you can change the story: one for NTR, the other for vanilla.