First of all, I should say that I am not into butt plugs (perhaps that should be the other way round) although I do like your use of technology and I couldn't help thinking about the possibilities. I think you might be able to extend your scenarios without any more hardware in the plug. Here is one suggestion that might give you some ideas. You need your microprocessor in a safe. The microprocessor needs to operate a relay which disables the solenoid which opens the lock on the safe. The scenario is based on this post -
viewtopic.php?f=6&t=12198#p87883 . Instead of being chained up you are “tethered” by the plug. You can take it out at any time. You can be chained up as well if you want.
So, you have a job to do. It should be something that will take more than an hour. Estimate the time for the job and deduct a little. Set the target temperature so that it should be reached in about that time. The microprocessor will look for a fall in temperature (because you have removed the plug) and will store the maximum temperature reached. If that exceeds the target the safe will open as soon as the fall of sufficient size is detected. If it is not reached the safe will remain locked and you will have to re-insert the plug. Note that the outside of the plug will have cooled more than the sensor, so the sensor will continue to cool before it starts rising again, so it will take longer to reach the target temperature than it would have done if you had left the plug in place. That will punish you for impatience. You might be tempted to get some warm water, in the hope of getting released quicker. If the water is too cool it will take a long time or never release. As far as I can make out, if you get the water too hot by only a few degrees you risk going over the maximum temperature quite quickly. If that happens I think you should be punished by having to wait for the plug to cool to some temperature you decide to program into the microprocessor, then you have to put it back until it reaches the target temperature. Lock up any thermometers! Another solution would be to chain yourself up, so you don't have access to warm water. Of course, you will need to do lots of experiments to get the times to determine exactly what parameters are required to give reasonable time delays, before you even think of using it.
I suggest you use it like this. Fit some some leg irons (the shortest chain that will allow you to do the job) and chain yourself if you want (make sure you can reach the safe!), put the key(s) in the safe and lock it. Shuffle to the job and insert the plug. If you finish the job properly the plug should have reached the target temperature and you can shuffle to the safe, it will open after a short delay, when the plug shows an adequate decrease in temperature. Then you can get out of the leg irons. If you are too early you will have to shuffle back and re-insert the plug with the time penalty resulting from the cooling of the plug. If you again remove the plug too early you will take another step back. A word of warning; based on my experience with my version of this scenario, you will soon lose track of where you are and end up in those leg irons for a long time. You do need some sort of backstop timer and, of course, an emergency release.
It is up to you what notifications the system allows you, perhaps by LED lights. It won’t tell you you are released until you have removed the plug and it has started to cool, so that won’t help you get early release. It probably should tell you that a cheat is declared and perhaps when the plug has cooled enough to cancel it. If you want a simple timer mode, it could tell you that you have reached the target temperature but, of course, you must be able to disable it for the above scenario.
Fun to think about, even if you don’t use it.
I think you might be able to do other scenarios along the same lines. A tip toe nipple clamp one would be interesting.
