The last time I wore this kind of underpants with fine rib and opening was many years ago. Now I'm going to try out the function of the opening in the panties with my cock. In the small size, it fits well through the narrow hole - which you have to practice again. But then I have my little boyfriend and he looks through the opening of the underpants and is happy to have fun with me. He is also getting a little stiffer and I am getting hornier.
