Years ago my mother in law caught my wife riding a massive cock. She challenged her as she had thought my wife was cheating. She explained that I have a small cock and usually cum in like 30 seconds and she needs strong cock. My mother in law started to make excuses for me, like it can’t be that small and bla bla. So my wife ordered me to get naked and show my dick. My mother in law was trying to her hide her smile but ended up saying ok, I get you now- that is indeed small. To make things worse she also ordered me to wank to prove how quick I am. I will never forget the shock on her face when I hardly lasted a minute. My wife said in pussy he is even quicker. My mother in law just said now I understand everything.