Does anyone know about mermaid yaoi?????

Yah Ive been looking fro that too.. Or maybe it's only available in lezhin

try this ~tag~ http://www.mangago.me/tag/mermaid%20yaoi/

and the only one I have can think of is: http://www.mangago.me/read-manga/tell_me_your_wish/ , happen briefly from chapter 16 to 18

http://www.mangago.me/read-manga/wadatsumi_no_yometori/
http://www.mangago.me/read-manga/utakata_no_uroko/
http://www.mangago.me/read-manga/mermaid_s_egg/ (but it's Shounen Ai)

okay mermaid sex is hot no one argue with me

Yes you are right