To unlock the 18+ scenes, you'll need to download the "14 Nights With You" DLC! There is a link to it on this Itch page, or you can also view my profile to see all of my games.
There is a demo/free version of the DLC available (with all the original 18+ scenes you remember from 2024), so please make sure to download that version if you aren't interested in the paid version.