The Tyrant’s Guardian is an Evil Witch

Story:

I appear to have reincarnated from the world of an r-rated romance fantasy novel. And not only as an ordinary character, but as the witch that loses her life into the crazy male lead! Luckily there's a long 200 years until the primary characters have been born and grow in their roles. Now my life isn't in imminent danger, shall we leisurely think of approaches to prevent death? But, I had not taken notice of an essential detail about the time I'd be spending'safe from imminent danger'. 200 years was by no means a brief waiting period and by the time that the younger version of the male guide appeared before me, I had completely forgotten the original novel's plot! Oh, whatever, now that it's come to this, the only way to live is to increase the man lead into a fair and stable adult! The first step to avoiding death by the hands of the tyrant man lead is altering this extremely frightened child's life. "It must be quite inconvenient for you to get me suddenly show up on your own doorstep, I am sorry. You can tell me to go away, I'll be OK." "Nonsense. Do I look like someone who could be inconvenienced by a little boy like you? Additionally, what do you mean by you'll be fine even if told to go away? It's not like you have anyplace to go back to, child." 'Ohthis isn't it.'