probably, Im hoping it does as I am still testing that out myself to be honest and cannot confidentally give a fix answer yet since I havent tested. But that is the goal, if u want to be safer, then you can purchase in itch io as it is basically the same price and the profits actually get to me directly more so than steam, but if you find it cheaper in steam due to regional prices then go ahead. The second dlc should be on steam no problem but the r18 cannot due to some rules and ratings details I rather not post here