The Defeat Events DLC is finally available on Steam. The moderation process took a few months due to the questionable nature of the sexual content. Personally, I believe that the DLC content is completely legal because these situations are fictional and mannequin monsters do not exist in the real world.
I apologize for the wait. As a token of my apology, I've set up a 50% off deal for one week. Enjoy!
https://store.steampowered.com/app/2987700/Cursed_Pantsu__Defeat_Events/
If you've already downloaded and installed the DLC from somewhere else, don't install it. This DLC is identical to the DLC on other marketplaces.