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It's not possible unless you took the abusive path or wait for updates 

But she comes only once every few days and her libido is at zero each I do it. I'm stuck on the fuck scene where I did everything to excite her and still don't have enough libido

How did you get to fuck her cause I'm doing all the things and she still not excited enough to fuck her

I already did it and it wasn't difficult. Did you use the cheats to level up. If you did, if you have a backup save, use it or you will have to start over. If not, check your quest panel to where you are and what to do (Priti's quest). You have to call Priti in the office by phone call and do the test. Don't skip a day or it will never work.

Don't forget to check classes to refrest your quest