Write a story about man and woman who are in a relationship. Woman is anal stretching addict who has very big pelvis, due to this, she can fit very large things into her anus. Her dream is to insert her man's skull into her rectum, the man agrees and inserts his skull into her rectum, the man becomes addicted to the smell and test of her rectum and goes crazy inside, they both cum from pleasure while the man's skull is inside the woman's rectum.