Summoning: Ho & Mizu the twin water and fire dragon

Ho: is a female fire dragon twin of Mizu: the male twin of ho. The are small kid dragon's that combine to make the Relaps a medium sized dragon with two heads and can use the water and fire element. When they are seprate and one of them is in their element back ground they can turm into their element. Example if Ho is next to a burning fire she becomes that flame. Or if Mizu is on a lake he becomes the lake.