Kinks like that have often times something to do with exactly the themes you've been successfully writing about. Humiliation. Imo they could fit into the game. It can either be some girl that is (secretly) into some NASTY shit. Which would be the more unlikely scenario and feel more tagged on because it would look like you WANTED those kinks in the game (which you clearly stated is not the case).
The other way around and considering the drug you mentioned in the last scene in the current patch would fit more. You have some kind of slave girl the MC really hates (There are several options) and/or the girl has fucked up MAJORLY. We are talking intentionally injured someone else kind of level.
In that scenario having the MC to decide to really make the girl fear the basement seems a logical option. Especially its been hinted for several girls, they like the pain. You can't really dominate someone if they get off the pain (though the collars would help) by inflicting pain because it becomes more a reward. Humiliation in this instance is more effective.
And adding some unwanted Watersports into the scene for example seems fitting imo.
As you mentioned. The tool of external Situation makes the MC be able to act almost schizophrenic. And the more experience he gets in both roles the more believable even quite extreme actions become. Extreme in both ways. Both Punishing and having a romance with a girl.
Also practical aspect: More tags means dodging more filters on
https://f95zone.to/sam/latest_alpha/ ;P
The game with the mile long tag list and good ratings goes up to the top (eventually).
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Completely different topic/idea. Don't want to make an extra reply for this.
I think a fitting scene for the game would be for the MC to have discussion with one of the girls (so they tell the others) about the one power (and pretty much only power) a sub has. The power of consent.
It should also a good way to teach the reader about this.
The important thing the girl/reader has to learn is the fact that the girl actually chooses to be subjugated to the treatment of the MC in the basement.
Because the girl always has a choice even if it may seem to the layman she doesn't. The MC should explain to her that she can leave the room at any point she wants to. But she will have to live with consequences. Meaning likely being expelled.
This may seem like extortion. But in contrast to actual torture the girl always has a choice to leave. That is the consent.
A safe word like "salzburry steak" can not just be used to make the dom simply stop but also the stop the entire treatment/situation. Any command for the sub is a constant evaluation between following the order or living with the consequences of not doing so.
The MC therefore should also explain the he will always tell the girl beforehand what he will do next. Not necessarily in detail (how often) but enough to give her the choice.
If at any point the MC for example orders a girl to sign a new contract that allows the MC to imprison the girl and/or using torture methods on her the girl has the option to refuse (and be consequently be expelled).
It doesn't have to seem fair. That is part of the deal. But the lesson boils down to: "You can always just.... leave". If she chooses not to, she gives consent by not saying the safeword.
Note: In other situation a safe word is used to make the dom stop what they are doing. This shouldn't exist in the game. The safe word here would be to stop, leave the room and expect to be expelled.