Here’s the BL that I know of for this;
This one’s surprisingly fun;
https://www.mangago.me/read-manga/rengoku_no_millennium_a_millennium_in_love_s_purgatory/
This one is very empty-feeling, but I don’t judge if it’s your thing;
https://www.mangago.me/read-manga/aku_yori_aku/
I never finished reading what’s out for this one, so I can’t vouch for it;
https://www.mangago.me/read-manga/hell_intern/
Main couple is ‘human x demon’, but to my knowledge there’s two ‘angel x demon’ couples on the side-ish;
https://www.mangago.me/read-manga/dear_door/
Technically also this one, but they both reincarnated into humans (though you see their old form at times);
https://www.mangago.me/read-manga/akuma_ha_tengoku_ni_ikitakunai/
Also didn’t read this one;
https://www.mangago.me/read-manga/heaven_hell_roman_company/
Or just search the tag, lmao
https://www.mangago.me/tag/Angel%20x%20demon/
Angel x demon. Pls. I’ve been begging for too long. Idc what genre even if they do water sports me and my hg do it too idc but please i need angel x demon. Idc gl bl straight even if you put non binary x non binary I’ll dick myself down and read it.