Just to make sure you get all scenes:
Footjob Sequence: Witch's Foot -> Witch's Demand -> Witch's Pincer Attack
Blowjob Sequence: Witch's Cum Squeezing -> Witch's Mockery -> Witch's Devious Tongue
Facesitting Sequence: Witch's Ass Trap -> Witch's Torture -> Witch's Takedown
Cowgirl Sequence: Witch's Licking Dog -> Witch's Domination
She will use Footjob and Blowjob as normal attacks. To get the Facesitting Scene, you need to wait for her to tease you with her ass and when she turns around, click her ass and select "Give in". To get the Cowgirl scene, get her to low hitpoints. She will strip off her panties and will follow it up with the sequence.
No other scenes currently in the game (source: I'm the translator). He hasn't given me any other script yet, so chances are the next enemy will take a lot of time. I would definitely advise not to expect monthly updates, but he has in the past posted snippets of his WIP animations on twitter, so that's something.