Me too (obviously 😂), though I hoped there would be a lot more than this. There are a lot of good posts on this forum, but it's the true stuff I always wanna hear.
The bullies who did fucked up stuff they can't brag about anywhere else without being called a sick bastard. The guys who know they shouldn't of done it, but would absolutely do it again if they had the chance. The things that became the final breaking point that made the woman refuse to see them anymore, but it was so fun that they don't even care that it cost them access to regular pussy.

Even if it's stuff they feel like they can't say on the forum, even better 😂

I like to keep things secret/subtle when I'm fucking a mom or a married woman, while slowly working her over, getting away with saying more and more fucked up shit about her family, and getitng her to join in. Till she gets off more on how she's betraying her family than the actual sex itself.

So in terms of the worst thing I ever did, I wish I could say something like "I made a mom hate fuck her innocent daughter with a strap-on while her husband and son watched, crying and trying to hide their errections", but if I'm being realistic, I'd say:

- Made a girl fuck herself with a cucumber, then put it back in the salad box and watch her family eat it.

- Turned a wholesome, loving mom into a slut addicted to cheating on her family, to the point that even after we were through, she couldn't stop. She eventually got caught and kicked out, and now her kids hate her, her husband only comes round when he wants to hate fuck her, and she's the kind of easy slut who'll fuck someone for a bottle of booze.

- (Idk how much this counts, since it was when I was young, not intentional, and involved a teen girl,  it a milf, but it did result in a loving family being ruined, so I'll include it) Turned a girl who had a wholesome childhood crush on me, into the kind of desperate teen slut that she spent her high-school years on her knees behind the local pub, sucking cock in her school uniform. Once it got out, her family were publicly shamed for not being able to control her, resulting in her parents taking it out on her, causing her to become an even bigger slut for older men, till she eventually had a breakdown, ended up In a mental hospital for a bit and swore off men for life, becoming one of those buzz cut lesbians. All because she wanted a loving boyfriend, and I wanted a fuck hole to practice on, before growing bored of her. (funny part is, years later we bumped into each other, and turns out her swearing off all men, didn't include me 😂)

- Convinced a guy to go after his daughter's friend, knowing damn well how badly it would probably go for him, just for shifts and giggles.

Probably a few other I can't remember off the top of my head, but that's more likely because I have a genuinely terrible memory, even for hot memories. Some days I can barely remember what I did a week ago, and other days I can remember every inch of my old high school, like I'm walking through some Sci-fi 3D map, even remembering the smells and how the wall felt 😂

Whether or not anything like that ever happened, its still fun to fantasize about it!