Please spare me, Villain!

Imagine, just for a second, let's imagine you end up somehow travelling into your favourite book. Then you started working your magic and you cosy up to the male lead who was supposed to get you killed or you make the demon lord fall in love with you so he can protect you from your imminent death. And woah you got your happy ending. But now let's imagine a completely different scenario where you end up in a book you read like 10 pages of (including the ending). And you find yourself literally dropped into the lap of a psychopathic rival who enjoys just a teeny bit of bloodshed. He's also the guy who killed your favourite character and not to mention you. But then you hold on for a second because you realise you're not dead and he wants to use you as an immortal tool to sharpen his aim. Well that's the story I ended up living in. And I've got one request from Mr. Villain over there, please spare me!