Among the girls, there is not headcanon route =)
There IS, however, a canon story~
I'm glad you enjoyed Seduce Me 2 =) Unfortunately, there will not be a Seduce Me 3 because I have many other stories to tell.
That does NOT mean the story is over for the incubi and Mika Anderson...
We expect the final content rating to be no more than a PG-16 game. There will be NO ero scenes, but it will have mild/partial nudity like in the CG featured in the demo.
As for submitting to Steam Greenlight, we very much hope to!