Short update on my current progress: work on the new game feature is progressing well! You can now talk to Hannah whenever you want and choose the "talk about sex" option.
She will then react differently depending on your progress in her story, accepting or rejecting you.
If she agrees, you can start sexual actions with her in the place where you are right now, or you can go to another place.
At the moment I'm thinking about how to structure the change of location and switch between different sex actions. I will keep you updated as soon as I have found a practicable solution.