You should try Harada's tentacle porn, here http://www.mangago.me/read-manga/uchuu_no_mozuku/
I recommend it :3
Thankssss~
Try myreadingmanga they have loads of tentacles porn. Be warned there's bara and shota there......
http://myreadingmanga.info/tag/tentacle/
Oh, I know~ There's loads of good stuff on myreadingmanga. The only problem there is that I keep getting pop-up ads and redirecting to other sites... ┗( T﹏T )┛
A lot of times, Adblock does the trick for me. Or Adguard for androids.
Adguard isn't available on Play store tho...
FINALLY some good tentacleporn here! Delicious~ ヾ(☆▽☆) This site is has way too little male tentacleporn, I hope they make more! Tired of visiting sketchy sites to find some. (づ￣ ³￣)づ