For me it depends on the girl and it usually takes a few orgasm to get her to do it, though it might be dependent on traits.I have tried it on a few girls though so there's that.
Re: [ILLUSION] ARTIFICIAL ACADEMY 2 (ジンコウガクエン2) [MASTER UP] [FULL MAKER OUT]
Has the maker been updated? Because there are two links that redirect to the download page in the update and the pictures for the maker look different.