To be completely honest, an actual corruption mechanic is the only thing missing from this game for me. That, and for the elven blacksmith to be a secret futanari who will also fuck Sana.
Another thing is that having Sana getting "raped" by monsters has no actual effect on her. I would like it, even only via pixel sex, to have world events wherein, if a given number of a given monster fucks her, she will start actively seeking them out. For example:
1. Monster X fucked her 5 times - An event where she "accidently" walks to near one, and gets "raped".
2. Monster X fucked her 10 times - Event #1 + another where she actively seeks them out.
3. Monster X fucked her 20 times. - Event #1 and #2 + a third one where she sets up the monsters somewhere near (like the basement of the inn), and sneaks off to them during the night.
If you want to be hardcore:
4. Monster X fucked her 30 times - All the above events + one where she brings along other female NPCs to her hidden "stables".
There may not be any actual corruption system as in having a corruption counter in the menu screen. It could just simply be that all of the things just happen and she tries to keep it hidden from her lover.
I always kinda look at corruption meter/ stats in these games as more like a "Corruption Gate", locking H-scenes behind a task just as tedious as grinding combat XP for a corruption XP grind, which isn't a bad thing but it just seems kinda pointless at the same time.
Like say
- Sana will give Handjob for Corruption Level 5 & Up.
- Sana will give Titjob for Corruption level 20.
And so you'd have to sit there repeating a "Skip Scene" feature if a game provides such a thing just for Sana to increase a tedious Corruption XP grind just to unlock progress for a titjob. My view on this is if she's coerced enough to do the handjob then she should just as easily be coerced into doing more without having to grind so much for it from repeating H-scenes over and over. What makes a corruption gauge even worse is that most games I've played have a day/ night cycle implemented where actions can only be done at night as opposed to what can happen during the day.
I appreciate games like Ideology Friction for example where you can sit there talking to a perverted old man repeatedly for quick scenes hiking up MC's skirt over and over to get MC's corruption state to progress faster from certain interactions -- to me, this system is a tiny bit more superior vs. a Corruption gauge system. There can still be a Corruption system but at least make the grind a bit less annoying to grind for.