Hey y’all! I’m sad because I don’t think this will be found and I was so looking forward to reading what happened next!

It was a J2 fic:

What I remember is that Jensen lived near the water and would often hang out on the dock where bratty!merman Jared would come to visit, steal caught fish and tempt Jensen into the water. It was an established relationship, and Jared got Jensen to sail his dads boat out into the ocean one night so that they could be together where no one would see.

There was something about Jensen jumping in and Jared started swimming wildly, and having to breathe/kiss air into Jensen lungs when he started to have a panic attack from going so deep into the water.

Jared did something that put Jensen in a sort of trance. I know they had sex and it was bottom Jensen, and it had a bit of a dub-con edge.

Jared had a bit of a split personality - a cutesy side and a dark, possessive side. Jensen wanted to leave for college and Jared wanted to keep him forever.

Does this sound familiar to anyone?

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FOUND IN COMMENTS BY blueforshort42:
Enthrall By: WetSammyWinchester
Jared is not a boy and Jensen is in over his head.