I have a mind to go evil today. I'm going for scandal.

You cum deep in her pussy and get her pregnant. Let's say she's a woman between 40-60yo (I know it's improbable, but it's my fantasy), she's done being a mother and is happy with the few kids she had (usually grown-ups now). She's a good woman, and her kids view her as a saint. So, what happens is that you fuck her, give her a baby in her late age, and ditch her and leave her to take care of the baby alone, and with her kids shocked and hate her.

I really like the idea of the first one. Having a brother who's always been the favourite. He always gets special treatment, is allowed to do whatever he wants, your mom looks the other way when he bullies you, and eventually she gives herself to him too. It's hotter for me personally if it's a younger brother, but any kind of relationship could work

There's actually a story about this called "Mom's Special Boy" by Asperger27. I only read the first part.

https://www.literotica.com/s/moms-special-boy
https://www.literotica.com/s/moms-special-boy-pt-02
https://www.literotica.com/s/moms-special-boy-pt-03

I have a mind taking this fetish into a dirtier level. I understand that this is not for everyone and many won't like it.

Imagine being bullied by your family members (it happens) and your mother takes the bully's side or is your bully herself (also happens), but can we add sex to the equation?

Examples:

• Brother bullies you and mom participates in bullying, and they have sex and neglect you.
• Household has your mom and sisters with you being the only son. You become subject to sexual harassment and other femdom practices, such as CFNM.
• Your mom marries a man with a daughter, she puts you and your stepdad into sexual humiliation, and has your stepsister join her.
• Your son takes over your household, that includes your wife (his mom) and your mom (his grandmother), and they all treat you like shit.
• You're bullied by your own mom, and she uses sex as a method to humiliate you.

What are your thoughts on the subject?

Yeah, there's a AVN (an adult visual novel) exactly like that. It's called the guy in charge

https://f95zone.to/threads/the-guy-in-charge-v0-21-totallyoklad9348.34478/

It's abandoned, so don't expect a full ending, but it's similar to what you said. Mc gets fucked over by his lil shit brother, n while you're gone, he turns your family against you so they don't even want you back.
But they have to let you back anyway, though they make you sleep on the sofa n give your bedroom to your brother.

From there, you can either be a lil bitch n go straight to whining and picking fights with your brother, ignoring his attempts to make amends. Then he'll seduce n fuck your mom n sis, just to hurt you.
Or, you can spend time working out first, get your shit in order, let the girls come to their own conclusion, n then seduce n fuck them to hurt your brother

Have fun, unless AVN aren't your thing (if not, you're missing out. AVN have the most depraved stories you can find)

Sounds good. My only issue is that the game is very big with 5GBs in size.

For me, it's a proof that this woman who paints herself as a saint is a whore on the inside

Not only do they literally talk about her failing marriage and make her show off the ring, but they ask her directly about her kids and how old they are, and she answers truthfully with an almost shocked look on her face like she can't believe how easily she talked about her children in a porn video.  Gets going around 2:50

Her kids should watch it now that they're older and learn the exact moment she belonged to porn instead of their family.

wasn't she arrested a few years back for breaking a plate over her daughter's head?

Adding to my above comment, I also have a reverse fantasy about the worship thing.

One thing is that your mother loves you in a normal way, but you worship her. Basically here you force her to treat you as a property. You make her treat you as a slave (ironically, against her own will). Mom finds herself forced to humiliate her beloved son.

Another is that your mother is the one worshipping you. She sees you as the alpha male and makes you treat her like shit. She makes you perform many humiliating acts on her because she sees herself as your sex toy.

For example, your mom loves rough porno, like videos of Rocco Siffredi of Facial Abuse. Would you imagine deepthroating your mom until she almost pukes or pinning your foot on her face while ramming her ass? You probably don't but she still makes you do it.