Was playing a duke somewhere around ERE. Nice stats, lots of troops, huge hoard of cash. All seemed set.
Managed to find a godly-stat, genius-attractive wife from a prestigious family. Great portrait and no chins either. RNGesus was with me, I felt.
Then some random, 1 county duke seduces my wife just because she was in range. He bangs my wife, bastard is born and I come to know of this. As he becomes my rival, he immediately begins a plot to assassinate me...which the whore wife decides to join.
I was livid enraged. I decided to dedicate the entire game to destroying that count and his family for ruining my dynasty and banging my wife.
I put my wife in the dungeon and oubliette, divorced her and repeatedly denied her father's request to ransom her. I also publicly executed the 6 month old bastard boy. The whore wife caught some disease and died within the oubliette.
Then I turned my gaze on the wretch responsible for this. I seduced and banged the rival duke's wife, who gave birth to two sons of mine. Then I assassinated her (and my own bastards, they weren't recognized). Then I seduced all his sisters. I killed all of his sons.
Then I kidnapped and castrated the horndog. 2 years later I kidnapped him again and blinded him. The duke couldn't handle all this, but I wasn't satisfied. I kidnapped him again and this time he was to stay permanently in my grime-filled oubliette, dying a horrible death from injuries and a disease.
He was succeeded by his only natural son. And I also seduced the daughters of the man as they came of age. I was populating their family with bastards left, right and center...only to kill them all along with their mothers after a while. Then I would kill the duke by blinding and castrating and then kidnapping them again. All my heirs were educated with high intrigue.
This went on for 4-5 generations. Eventually I seduced their family to the point that all children being born in that dynasty were secretly mine. I didn't even leave wives of brothers.
...I killed them all. I kidnapped the last duke and castrated him. Executed all 3 of his sons. His wife kept giving me bastards before I killed her. He had to watch all this happening around him...knowing that his dynasty dies with him. I had him excommunicated and then planted a false rumour about him to the emperor. He was arrested and blinded. Then he caught a disease and died. His dynasty was finally destroyed.
When this save was done, originally I felt really guilty over my monstrosities and deleted it.
Oh...now I wish Reaper's Due was released back then, to have even more "fun".