Law had been a victim of sexual abuse by doflamingo in childhood and he still is traumatized by those memories. He still has nightmares sometimes about those bitter memories. But no one knows about it even luffy. .... One day luffy and law were sitting on the couch and luffy was bored. He tried to read book like law but he couldn't. So he started to tease law by kissing his ear and neck and giggling under his breath but he didn't know that he was pushing law to his scary memories from the past.