Hello. In fact, most of the not inherently bad ideas have nothing to do with chastity. This is more about game and bondage devices in general
About new devices: Plugged Chastity Balt and Spiked Cage which applies Lust or Willpower Damage. You can also make all the objects affecting Lust (at the moment it is Nipple Suckers and Buttplug) should give damage once for some time, and not just in “battle” or “sex” scenes.
The piercing can be not only vibrating, but also, for example, shock - acting less often, but reducing Willpower and with a chance to interrupt the action (in battle). You also can add slots for the clitoris or dick piercing . It is possible to create devices with remote control or operating by a timer. There is also an idea to add a device (for example, enchanted piercing or owl fidelity) a completely blocking orgasm. In addition, you don’t need to answer the question of how this is possible - it works because magic.
To this (and described earlier) you can add a new Arousal mechanic. From various factors (the attitude with the character, wearable ITEMS, various states and effects, Denied/obtained orgasms) would depend on the level of arosual, which would affect the base level on the resulting and applied Lust Damage. This would convene various situations on the verge, when the game would vosit the player for the risk but punished for a mistake. To this, you can add the opportunity to masturbate in a hidden place to restore Lust and reset arusal ... or force someone to publicly masturbate for the sake of humiliation and development of Dom/Sub relationships.
Speaking of relationships - how about make it possible to ask the master to lock certain items on it? According to the anology, the player’s servants can also ask for something similar at a high level of Dom/Sub relations. You can also arrange the "Find the key" game what would call the player or the NPC look for the key by wasting his time. It will also not be a bad idea to add the capacity to equip certain Items only for the duration of Consual Sex Scenes.
And also a small advice not on the game itself, but regarding its development. The art in the game is not enough, and it is very difficult and expensive to draw on all possible scenes. There is an idea how to avoid this: create a background for each important scene, and apply items, characters, bondage items, Effects, etc. Find the game Parasite Infection, it is on F95zone (
https://f95zone.to/threads/parasite-infection-r1-11-anon-smith.6213/). The game is certainly not for everyone, but I recommend that you see how the game files are organized. You will immediately understand what I had in mind.