Someone actually posted a mod somewhere that adds bulging and cumflation, but I don't recall where. Maybe try the main page.
So here are the files I used to mod it. downloaded from the dragauka.itch.io or something like that, i forgot.
the folder contains both the patcher files, the patcher itself and in case it works, prepatched files.
So first things first:
open the root of the game, and go to Archipelagates_Data/managed/
there first backup the assembly-CSharp.dll and com.naelstrof-raliv.fluid-rendering-for-games.dll, copy them to somewhere else, now either try my prepatched files and replace these here.
if it works, then when you load into the game you should be able to see new "Mods" button on the bottom right corner when you're already controlling your character, not on menu screen
if it doesn't work. you'll have to : unrar the rest of the files, start the delta patcher, replace the pre-patched files with your backup (keep the backup still though) and then point the delta patcher to the csharp assembly, then to the archmodassemblypatch, and run it, same thing with the com.naelstrof-raliv.fluid-rendering-for-games.dll and ArchModFluidPatchV6_41