Most of the adult content will probably stuck to fun, silly and consensual stuff.
Though I imagine that includes kinks like pet-play, doll-play, sneaking into bedrooms, public humiliation, maybe some bdsm, and other things that have a bit of a psychologic edge, but are fun for all parties.
That said, I think it would be fun to explore some other ideas in the main story. There's a mystical side to the story that will come out, that might have some interesting angles to explore. But I haven't decided exactly how that will play out yet.