Adored the format of that story, clever usage of the common twine options.
For nitpicky critcism, I felt like the knight became way too trusting of Jeanne too quickly, but I empathize that fluffing up the painful to write parts, even for the sake of pacing, is hard.
Similarly, the knight accepted the identity of their soul surprisingly quickly. I'd expected a bit more resistance, bit more denial. Not that that couldn't be fixed - maybe a quick lore sentence that mentioned that the mental image of souls is really that big a deal and that's why they didn't struggle to accept it so instantly.
The rest though... Oh boy. It feels very... primal, very heartfelt. Like that's just how it came out of the author's hands, and it was naturally good.
the NSFW passage was cute <3.