Cool! I love the whole concept of the Gayme! <3
Reminds me a bit of "Flesh Cult" (which was more hetero-sex-focused from the background images at least, but supposedly might be able to be modded - not sure if on that Level though) but in a gay-sex-focused Version (and without the sounds - which I dunno if they would take that much space if able to be relatively easily implemented in the Mini-Sex-Games? - Sound [sample] files can be compressed very much without losing their quality - especially if it's just moaning sounds for squelching etc.) .
Would be hot if Lovense-Toys could also be made to respond - but that's only something to consider as a "place holder" and implementation at a much later stage then (but would need you to look at their API to know where to put the placeholders).
But all in all the concept is really HOT and I hope we could design our sexy possessed Demon Stud/Slut too for the fun of it (he'd get a fucking massive dong in my version for the fun of it and hyperspermia if we can choose "perks" from his Demon-skills).
Yet, even if none of these are things you want to implement, the Story and Gayme as it shows right now are already enticing enough for me to play it - the fact, that it inspires the ideas I just expressed (as suggestions, and not expectations!) speaks for itself. Only happens if I'm excited about something already and then stuff sparks up what "would be cool/nice to have" for maximal immersion based on the Story-writing immersion. You know: there's always possibilities to "tickle out a little cherry on top of the yummy cream-cake" ;-P But first, the "creamy cake" needs to be baked and solid enough to support them, of course.
Hence just my "going overboard" a bit with possibilities I could imagine for your cool Gayme. <3