Wow... sorry for the wall of text. Ideas led to other ideas and here we are. I'll edit the 1st post and add in new ideas for traits and training methods so they'll all be in one place.
Yeah the idea of jobs is interesting. There was an older flash game I played a long time ago that was mostly text with some rudimentary graphics that had a job system. It felt more like a Geisha trainer than a slave trainer. It has class and more "high end" traits than just sex skills like etticut, cleaning, yoga, ballet, and such. I want to say it was called Slave maker. there was another old flash called sim-brothel.
Then there's a bigger one called Sold Girl Town that focuses more on the training/torture methods, but Sold Girl town does have an interesting brothel system with different parts of the city you unlock. Then you put different girls in each neighborhood based on skills and local preferences. Sold Girl also has a gold sink in a skill tree that improves your training efficiency, recruiting efficiency, brothel profits, and unlocks training methods, maintenance costs, etc.
There's also a more recent trainer called Dorei-Syoujo-A that's mostly a sex / torture game with no real depth beyond unlocking new outfits and torture methods.
I'll see if I can dig those up and refresh my memory of how those systems worked with the jobs and skills related to them like cleaning, dancing. One of them had cloister training with Nuns which has potential to interact with the temple in your game.
This provides a choice system where you're choosing between lewd and classy. Training on one side or the other lowers traits on the opposite.
In the vampire theme that might look like choosing between training your brothel girls or training a harem of subservient vampire queens that might have more class and combat skills following out of love/happiness vs fear/obedience.
That could branch out into an automated recruiting system. Your vampire queens add to your slave pool by sending them out hunting. Depending on how far down the automated farming path you'd want to go, your queens could also seduce miners and loggers (ghouls) that produce automated incremental resources. This type of game often combines direct player action of going out hunting with resource management mechanics to provide a bit of depth/variety. If you went this direction, you might take the stone/wood farming out of the player actions and convert that into finding ghouls to do your mining for you which eventually grows into vampire queens that find your ghouls for you.
Then instead of resource farming, your player actions would be finding the ghouls, brothel slaves, classier vampire queens, going on quests to expand territory or find more powerful rituals to level up with or new spells. (This could actually be done even without the management system in the game.)
Almost all of the trainers I've played has a system of pushing the girls too far and breaking them in one way or another by either going catatonic, sex crazed, running away, or ending.
You could also consider an energy system / action point system to pay for daily actions that gets replenished by drinking blood.
I've rambled quite a bit here. I guess the thing to do would be make a list of what you like, what you think would work, and what you want to prioritize.
So in the adjustable skills section new options are.
Lewd, Etiquette, Cleaning, Cooking, Flexible (contortionist, yoga, gymnastic performance), Religious / Pious, Persuasive.
One thing I noticed going from an older version to the current version is the crying oral have effectively been removed from the game due to the low obedience threshold to move that from forced to willing, most captured slaves are already above that threshold at capture.
This isn't really something that's broken in the long term because additional levelable traits and skills and multiple training methods should give players the more options about which "sex Scene" they want.
Well... on second thought, maybe the issue/answer is moving the scene results from the obedience threshold to the love threshhold. So the love threshold unlocks willing participation in training and sex scenes. The obedience threshold unlocks the ability to put the slave into the brothel and what services they provide in the brothel. (Circling back to the neighborhood idea from Sold Girl Town. some brothel clients might pay more for the willing, others pay more for the unwilling) The catch is they lose more sanity / happiness rating when unwilling leading to bad results.
For now you don't have multiple training options to train obedience vs increasing love/happiness, so there's no way to separate the results of training into multiple paths and different sex scene options.
So some love training options might be cunnilingual, fingering, massage, sex toys, (pleasuring the slave) or maybe vampire hypnosis induced self pleasure, fine dining (fine clothes, food/wine/drunken seduction)
