Hello,
There is no seduction system implemented, however there are certain events/situation where you can submit/seduce.
Also there is plenty of consensual interaction in the 9 safe zones where you can make Jessica a slut... ;)
I played through the Demo, water area and all, and I must say I had a ton of fun and the game looks amazing! Well done indeed and I can see a lot of love has gone into it. At the end of the Demo it says you will be supporting the game after release, and I think that's great. Perhaps more situations can be added in future, but I am happy to hear that there will be plenty of situations where she can be more "free" to explore her sexuality. I can't wait for release in a few days!
Thanks!