This is a sequel to Ana Pepper's Monstrous love https://e-hentai.org/g/2576460/8753416138/ that involves women making some intimacy with some friendly monsters which is softcore only this time with one story different from the others where a human interacts with a female sea monster.

the authors site is here https://www.anapepper.com/

order page- https://www.anapepper.com/monstrouslove2?currency=USD

Also the author is currently working on a webtoon for webtoon canvas called https://www.webtoons.com/en/canvas/angela-and-bob/list?title_no=1048923