despite the fact you have a cumflation javascrip outside the "js mods files", you're missing a critical piece, the mod realistic ejaculations, i couldn't find it among your mods and is a "must have" mod for cuminflation to work. so to solve your problem i would advise download the mod realisticejaculations(
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) and moving the cuminflation javascrip back to the same folder in mine game (Hazumi and the Pregnation\PPLSS\www\mods\JS_MODs_files), and try again. wish you luck.
edit: to clarify the mod realistic ejaculations is responsible to allow cum to enter hazumi womb while on prostitution events, the vanilla game only allows the cum to travel after hazumi sleeps and the amount that travels is really low and more is removed than add each day, so she will never inflate without realistic ejaculations. if you have any more question and concernes, feel free to ask, i hope that i have explained it in a easy way, i'm brazilian so english isn't my first language.