Brief guide to interacting with jasvalla content because she's buggy and very poorly explained:
-6-7 days after your initial meeting on the elevator, Jasvalla will start "hunting" the player
-The location of these hunts depends on your level. At level 2-3 they will take place in the Mhenga jungle. At level 9-10 they take place in the mines on zheng shi. I THINK that all in between levels take place on myrellion, but I am not sure. I also THINK that its impossible to trigger them at level one, but am not sure.
-The hunting scenes take the place of a random combat encounter at a fairly low proc rate. It took me 20 minutes of sprinting through the mhenga jungles as fast as I could to lose to her 3 times and unlock the sub training.
-Proccing a jasvalla hunt has you engage in level-appropriate combat with her. If you win you can top her. If you win too many times she might fuck off? Not sure
-After the player loses 3 times she will stop hunting you in the wild and invite you to her apartment on the east end of the tavros res deck to begin your sub training
-The loss scenes bug out if you're pregnant, even if you're pregnant FROM HER
-After your first visit to her on tavros, she will refuse to interact with you further until you remove all penises if you have any. Attempting to proceed with further training while still having a penis will just result in an instant failure
-She'll permanently enslave the player after something like 6-8 training sessions (bad end). I think you might be able to drag the training out longer by letting more time pass in between sessions, it seemed like I was able to get more scenes by going back to the ship and spam sleeping for a week in between visits.
-The training scenes are random, but one of them is anal training with a dildo, getting a "pass" on this scene requires 250 anal capacity, but the training itself only grants 25, so its essentially impossible without help by spamming easyfit beforehand (she'll enslave you before you've accrued enough training to pass unless you use easyfit)
-If you don't want to deal with this character or futa-dom content just isn't for you, it's supposed to be possible to just go tell Penny you have a creepy stalker and please arrest her, but something with the patch broke Penny's talk menu making it impossible to ask her.