I know one but don’t remember the name lol the smut was weir lol but not bad
Orenchi no Furo Jijou
It's Shounen-ai though.
my favorite mermaid bl tho it's just a short story of 16 chapters (completed): https://www.mangago.zone/read-manga/the_first_love_of_the_sushi_restaurant_owner_is_a_mermaid/
Mangas:
https://www.mangago.zone/read-manga/koi_uta/
https://www.mangago.zone/read-manga/samezoku_e_no_sasagemono/
https://www.mangago.zone/read-manga/wadatsumi_no_yometori/
https://www.mangago.zone/read-manga/itoshiki_ningyo/
https://www.mangago.zone/read-manga/wild_fish/
https://www.mangago.zone/read-manga/junketsu_ningyo/
Manhwas/huas/webtoons:
https://www.mangago.zone/read-manga/the_falling_merman/
https://www.mangago.zone/read-manga/wave_nail/
https://www.mangago.zone/read-manga/mermaid_s_egg/
https://www.mangago.zone/read-manga/do_you_wanna_touch_my_tail/
https://www.mangago.zone/read-manga/gone_with_the_bubbles/
https://www.mangago.zone/read-manga/i_suspect_the_movie_emperor_is_luring_me/
https://www.mangago.zone/read-manga/mermaid_s_love/
Hi dear, here are some more recs if you’re still looking for them I hope you enjoy!
Pls pls pls