The only one I'm seeing is the normal Womb of Lust, which says it lowers Willpower by 5 per day.
Just went in and used a few of the tea items to raise my Willpower back to like 80. Ended the day and started the next back at 15. No idea why.
Been awhile since I've updated, and I'm just now getting to a lot of the new content. I seem to be permanently stuck with Curse II/III though, and I'm not sure how it works.
My Status screen says I have 87 Willpower, but no matter what I do it seems to hover around 10-20, always leaving me heavily cursed and with the 30% stat penalty.
Is this just the result of picking lewd/corrupt options throughout the game? Or am I missing something to completely reset my willpower?