I want my wife to take a giant dildo

I've always wanted my wife to take a really big cock and she's always told me she wants that too. But then she told me she wants a really fat cock, one that's so thick that it's difficult for her to take, and that's when I started to get obsessed with the idea of getting a really big dildo for her. I doubt we would be able to find a real cock thick enough that she'd have trouble taking it so I think it would be incredibly hot to buy a really thick dildo and see how much we can fit inside her, to see how much pleasure she could get from getting filled up like that.