itch.io

Exactly when it happens its probably after the end of the mission when yougo to the grave yard in transilvania, no more spoilers

*Do you remember the Succubus Gal in Transylvania?

She does it, you just have to inspect the poster right in front of you when you enter Transylvania, then you will unlock the option to be Hypnotized by her (or resist) and in the process gain a timed effect that boost your Experience gain by 30%*