Both are in the game. Go try and find Ferrum in the market, first for the book on flowers then alone for the wine. Think you only have a chance though so you might have to repeat a bit.
Finally triggered it on a new save... Had sex with Sylvie out in the forest and she spotted the flowers, then after a few failed trips to the market we found Ferrum and got the book.
Kulman might have found the issue.
Partially censored if you check the opening post, expect things straight from DLSite to be censored by default though. The patch from tfpatchguy is now fully decensored, but for it you'll have to
assemble the game yourself.