I Took the Male Lead’s First Night

She woke up to find herself possessing a minor side character whose name she could barely even remember.
Since she was a noble, she decided she might as well enjoy a happy life to the fullest until the day she reached the story’s ending.
But on the second day after transmigrating, the man she had spent the night with turned out to be…

“A man and a woman giving each other their first night’s purity means they are, naturally, responsible for one another, don’t you think?”

It was none other than the novel’s most obsessively possessive male lead!