Siren x Kappa

There's no lemons.(Their human but when salt water touches them, they turn into their merman and shark form. Kappa's body is covered in his golden scales, just his face, hands, feet, the middle part of his chest, back, stomach, legs, thighs and neck aren't covered in scales. Same thing with Siren but instead of scales it's his shark skin and he has his shark teeth.)