I tried looking for it on my already-read list, and I can't find it 〒▽〒
hey I found it but it's in another site, here is the link
https://nhentaiyaoi.net/jashin-ni-irareta-sei-kishi-afureru-bonyu-no-eikyu-zeccho-3/
But I'm not really sure because you said Demon King, and here in the story it's the Evil God...
Oh my god this is it !!! I think I was misremembering since the trope is alw demon king. Thank uuuu
WC
Manga BL where the uke was a dad who took his daughter’s place as a demon king sacrifice?? It was multiple parts and smut and I’m pretty sure he reunited with his daughter in the second part but he still chose the demon king ?? Anw I’ve been trying to remember what it was for DAYS but I’m convinced it may have been a fever dream at this point