That did it, thank you!Yup. It requires a bunch of stuff. She needs to love being covered in cum, have an oral skill of 4, and sluttiness 70. You also need to have broken taboos for blowjobs and (most surprisingly) condomless sex. If I were to hazard a guess, it's that last one you're missing.
SeeSerums/fetish_serums.rpyfor more info.
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