You left a questline before and didnt complete it hence the issue. This should never be done. My suggestion would be to check Jason questline and see if you didnt finish it.
Nope and yes in a sense. But not recommended, as it is govern by love and relationship and if edited can mess up your game.
You have INCEST OFF. To reach this part so late in the game,
you missed tons of scenes. e.g. With incest off, you may get a kiss with Sarah rather than the true scene such as sex. In this case, there is a bug with Lucy for those who have incest off with the image. You suppose to just get a kiss and the game continue. BUTTTTT with the incest ON story, you get a nice sex scene. Honestly bro, you should start a new game and turn incest on early.
I have said a thousands times, use the gallery mod on a separate folder. That mod causes real issues in the game from the so many saves people send me to fix.
My mods do not cause any bugs in the game.
All my cheats, if cause bugs, are
localize bugs. Meaning, they do not affect the game, just the cheat option.
Anyone can simply fix by just not using that option.
It does not damage your save or prevent you from playing or continuing any story line