Ok.
My wife is a bit of size queen, I bought 13 inch BBC dildo right in the beginning, she refused to even look at it fir few months, but I slowly introduced her to it.
Once after I fucked her to a thundering orgasm while she was still experiencing aftershocks I slowly put the monster inside her and she didn't even realize until half of it was inside her, that's how it started.
Now she bottoms out at 11 inches.