A question for the cuckolds

I finally got the courage to set up a meeting with a local bull. I asked him if he can fuck my gf once a week. I also made it a point to tell him that I want his black cock to ruin her holes and stretch her. I told him that I'm not going to be using any toys or stretching her myself.

So my question is "Can a BBC really ruin a pussy permanently and also how long does it usually take?"