It can be found as DLC for the game on the Steam Store: NEKOPARA Vol.3 - 18+ Adult Only Content
If the Steam Store page isn't working, you may be able to install it by either clicking the following command or running it directly on your PC: steam://run/947670
Note that this will immediately run the game and start downloading the DLC if possible - you may need to close the game and wait until the DLC finishes downloading for the patch to work.
In the "Effect&Sound" Config menu, there is a "Turn H-Animation On" option (which should be enabled), and after cutting Vanilla and Kashou's nails there should be a scene where they get intimate with you, instead of skipping straight past it.
Steam store: https://store.steampowered.com/app/602520
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