The .var extension indicates a "VaM Archive" file used to package models, textures, and plugins into a single distributable file for the game.
The creator's Patreon or Afdian for early access and exclusive content. Mowang_nixi.Sexy_01.1.var
Third-party resource sites like vam18 or hellovam often list these in large creator-specific collections. Mowang_nixi.Sexy_01.1.var