Responses
https://www.mangago.me/read-manga/ganbare_nakamura_kun/
umm might not be this but the mc is really into octopuses ^_^
Perhaps it was this one?
https://www.mangago.me/read-manga/ero_yume_aquarium/
Yes!! thank you!
The seme is a nerd in aquarium or animals life dot dot and uke like him lol? I don't remember much I think they're in highschool and shounen ai