I might be mistaken since I don't have access to the game's source code, but it seems there may be a collision detection issue involving fluid simulations and female character models. Specifically, the fluids don't appear to properly interact with the model's internal geometry (vaginal walls etc.), instead passing through as if collision boundaries aren't being applied.
I noticed this while recording
the clip I shared earlier, the fluid collects oddly around certain areas on the body (like the chest) instead of following the expected inner contours of the model during penetration. That could point to a collision or physics setup problem related to the mesh or material configuration.
In other words, creampies are kinda borked compared to the previous game version and could use a fix.