What are the actual odds of impregnating a princess? I'm trying to get the slime princess to join me so I can sneak into other places (I'm aware I could spend money to buy a consumable item instead). She is supposed to always be fertile but I've been visiting her every night for weeks without anything happening.
Just unlucky?
Another question, as I start to collect princesses I realize I'm going to have to pay money everyday for the ones I can't hold in my party, is there a way to make a daily income to offset that? I don't know how expensive it really gets if I make too many friends.