I have another problem about vampire relationship point system, I try to increase relationship vampire but it was drop point into 30 point after give her love potion and present. After gift her present, it's drop into 0 point. I try gift her present and love potion, still stuck 30 point relationship, please fix.
Love potions have a negative effect when the relationship with the girl isn't high enough yet. You need to increase the relationship with normal presents and events first, and then later use the love potions and/or events to get to 100.
