Lucifer tampered with a soul created by god until he realized what he could do with this. He made the soul to be his champion for when the soul died. Y/N died as a soldier for the U.S. when in a heated battle. Once he entered Hell, he was rather surprised to find himself to be in a nice office with Lucifer himself standing in front of him

after giving birth to their child, sanji and Zoro hadn't had sex and Zoro started to get a bit sexually frustrating.