Yep, my first twin was my waterbaby. I wanted to give birth to the 2nd one in the water as well but I wasn't progressing fast enough for my own taste so I got out to speed things along. FWIW, my waterborn twin is the laid back one of the two. My waterborn singleton was also more calm (as a baby) then my land born singleton.
Mama to four remarkable kiddos, all born at home.