@Frostbite as far as I know I guess Mermen do have human-like penises, though they r hidden behind a veil of scales, but during mating they just pops out of the skin and do their work... (I dunno if I made it clear, still, I hope my answer helped 😅)
(Trans masc + Pansexual 🤧) 🏳️🌈🏳️⚧️
too traumatized reading toxic BLs
IN NEED OF SOME NON-TOXIC BLs
(reccomend me Pls🥺)