I love the idea of forced impregnation
I don't normally have fantasies like this, but I just had a thought that turned me on so I wanted to share it. I'm imagining a gangbang set up for my wife, where she's tied up and has a diaphragm in so the men don't have to wear condoms. After a couple of guys fuck her, they decide they don't want her to have the diaphragm anymore so they remove it, and continue fucking her, all of them fucking her pussy and cumming inside of her multiple times without any protection.