Kai(your bf) had a twin, but the only way you could tell that it was your boyfriend was his eyes, your boyfriend's eyes were green

Kev (his twin) had golden colored eye

you were taking a shower, the cold water running down your skin. Suddenly you feel a pair of hands gripping your thigh, you though it was your boyfriend kai

His eyes slowly opened, to your surprise he had golden colored eyes, it was his twin kev*