I'm confused. In the previous version I found it easy to sleep with Evelyn. Now it's changed and no matter what I try I can't make it work. I've finished all of her invade minds and have a save before I've told her my true feelings. There's an option about sex before marriage but I just get told my belle I need to power it up more. But I've tried going right to the end of the game and it's still not powerful enough. Now on my new game plus with all stats it's the same. I've tried spending loads of time with her and can make her sleep with Callie.
I've also noticed the figure out her secrets is gone from the to do list since I've completed that.
What do??
If the game is working properly:
1. Sending Evelyn to Callie before becoming Evelyn's lover can cause Evelyn and Callie to become a couple without you - then you will no longer be able to romance either of them.
2. The process for Evelyn's dark secret and inhibition is unlike most of the other women in the game. You learn about the "sex before marriage" inhibition while revealing her large secret (about going out and meeting Aldred at night). You cannot remove that inhibition until you have revealed her dark secret (about family records). The process to make it possible to romance her is:
1, Reveal her dark secret
2, exit the spell and talk to her about the secret (it's a separate choice, not automatic).
3, then go back into the remove inhibitions spell and remove her inhibition (which you won't know about if you haven't also done her large secret).
At that point it's possible to tell her how you feel without having her leave town, and if you've spent enough time with her/told Thaddeus to leave her alone, she invites you into her bed at night.
If you have indeed exited the spell, talked to her about the dark secret, and still can't remove the inhibition, it sounds like your game is corrupt.
(PS: the "sex before marriage" inhibition is in the free and patreon subscribers versions of the game, in the subscribestar subscriber version, it's an inhibition against incest but the process is exactly the same)