#someday furina will be long gone and so will everyone who knew her

[hydrachea]

Yknow I was also thinking... if Neuvi were to ask Furina to become immortal again for his sake, she might actually say yes. Which is exactly WHY he'd never ask her to do so, because as much as he dreads her inevitable absence, he won't condemn her to that fate again

You got it. Because when she took on that curse half a millennium ago, it was also a request she agreed to. For the sake of all of Fontaine and not just the sake of Focalors, but it's still all too similar. Even if she said yes to him because she actually wants it then, who's to say she'll always want it? Who's to say the decades, the centuries won't weigh heavier and heavier as they pass, just like before? Who's to say she won't have to ask him to make her mortal again? And that would be even more painful than simply letting her go when she's meant to. So instead he'll treasure the time she has, that she's more than earned, and he'll do everything he can for her to treasure it too.