I discovered the incredible project https://buttplug.io/, which creates a single interface for users of toys, and developers (such as myself), to easily use any toy with any game that supports it (or that has had support added by modders).
After just a couple hours of playing with buttplug.io, it appears to be SO easy to program for, that For One Year's early-access launch will definitely include support, to some degree!
The depth and breadth of that support, I can't make specific promises to, since I'm not far enough into using the software to know what problems I may run into. Here are two possible extremes:
Best-case Scenario
In the best-case scenario, For One Year will launch with a feature that allows players, at the start of a scene, to pair devices with parts of their bodies, and to have those devices activated when the character in the game receives attention to those parts of their body. For example, there is a threesome in the game, and your character receives attention on multiple parts of their body, sometimes simultaneously. I believe buttplug.io will make it easy for me to do this.
Worst-case Scenario
In the worst-case scenario, the above proves more complex than expected, and For One Year launches with a simpler "uh, just select one device, and For One Year will activate that one device no matter what part of the player character's body is receiving attention".
What to Expect
I expect reality will play out somewhere in between these two extremes, but where exactly is impossible to know, at this point.
I'll keep you posted! :)
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