Apparently the human anus can stretch up to 5 inches in diameter (2.5 inches radius). A sharpie marker is roughly 11mm in diameter (.433 inches). Math shows we’re a long way from the max record!
I think I might be addicted to hurting my nips until they’re swollen and tender and then the sensations are even more intense hehe. They get so soft and plump like marshmallows, would you nibble on me?