Tobe, I noticed a possible bug with lessons:
I created a 1st lesson from 45 to 65 openness, repeatable.
I created a 2nd lesson from 65 to 85 openness, repeatable.
In game, the girl is 64 openness. I launch the 1st lesson, the only one reachable. She gains 1 openness.
The 2nd lesson is then not available, the 1st lesson launches again.
Again after openness raises to 66, still the 1st lesson available and not the 2nd one.
I had to quit the game, come back in to have the 2nd lesson available.
So in theory maybe there is a bug to switching lessons when in the same game session.
Thanks for your feedback about it.