Isn't dolphins and other fishes penis hidden underneath the skin? And gets erect when stimulated and kinda pokes out of there lamaooaoaoaoaoao
But it's too small to penetrate anything, plus from what I read merfolk was more like fish than mammal. But meh, I might be wrong
I'm religiously studying water creature myth all around the world, lmao. But yes, after some research merfolks do have a penis, though they were portrayed as an innocent creature thus sex for pleasure is not in their dictionary. Though that didn't work for sirens or any other water creature
We take fish penis very seriously in this household (▰˘◡˘▰)
Have you taken the oath of Poseidon as your lord and savior? This is a rough path y'know
Good lord, you have a really long research to do (￣∇￣")
Fun fact, merfolks actually reproduce just like fish, they laid eggs out so.... I'm not sure how this is going to happen since they don't necessarily have a dick. But hey, it's BL. Anything could happen ヾ(❀╹◡╹)ﾉ~