my penis is to large for my friends vagina

[visage]

So my penis to large for my friends Vagina. She is concerned. Now I told her the vagina is like a muscle and has to get use to such things. However, much like piercing I imagine they make Vagina Tapers to get it to open more. My question is has anyone expierenced this problem, and are the effects long lasting? Quite frankly I imagine it will be painful to her if I put it in , but the plus side it will feel amazin for me. Now with pleasure comes sacrafice for some. So if I want it to get smaller again , will it ever get to the point is currently is , if I find a way to enlarge the hole. Your thoughts and opinons thanks
~Visage.