You gotta shake that tail, Deku.
———
Some time after that…
The merman. The future King of the Sea, that's Bakugo Katsuki crosses his arms in the day of the ocean.
Deku's being his old crybaby self again.
"If you really want eternal life, Deku. You gotta stop crying all the time. You may be part human now, Deku. BUT! You're still part mermaid, hon. And you still have duties to attend as a merman.
"NOW SHAKE THAT TAIL!"
Izuku breathes.
"I'-I'm trying, Kacchan!" He squeaks, gulping.
But Izuku's always sucked at swimming, even though he was born a pure mermaid, for crying out loud.
"WELL TRY HARDER!"
"Waaaa~"
"Kaaaachaaan~"
"H-how do you swim so well," Izuku sniffles.
"H-how are you so good at everything…"
Katsuki rolls his eyes. He swims over to love and takes the greenette's hands in his own.
Izuku blushes.
Katsuki glares, pink dusting his cheeks.
Resisting the urge to kiss his cute, freckled face.
"You're a mermaid, Izuku."
His voice is that of a serpents'.
"You gotta move those hips like one." Izuku shudders as Katsuki swirls around him.
"And feel the rhythm of the sea."