Fish And Shark- Rin X Reader LEMON

"Fish? What the hell kind of name is that?" You answer.
"Well I don't know...you like the name 'sea barnacle' better?" Rin chuckled as you both started walking.
"That's even worse! If that's all you have, I'm taking the fish one." Your arms cross against your chest in disapproval of the newer nickname.
"Okay then...if I'm fish...you're shark!"