Titty fucking

So in a post about titty fucking, there is one thing that has to be established right off the bat. I have big boobs. They used to be huge boobs, but I've lost some weight and switched birth control and they have shrunken down to a respectable D cup. I've heard titty fucking is possible with small boobs, but I have no idea. I've never been interested in doing it with a strap on, and I have no