It's not random. Go see Rinny for a certain 'spell', then come back and fight the bandit girl~.
Found a bug with fairy, fishnet will remain in its place after you been surrender(playing scene). (also, fairy dildo will be a really good idea, a picture cut scene will be great)
The Drain Kiss is the only spell I get of Rinny, and if I ask for magic lessons she tells me "maybe later".
Also, even with fertiltiy pills, Rinny cannot impregnate the MC for some reason
As far as I can tell, there is no content besides Transylvania and roaming around New Ark city ATM. The Science Tower, Flesh parasite base, Desert, Milk factory, etc are not available yet.
EDIT: Nevermind, got it