Wow, this is incredible, I actually didn't think it was possible, but it seems it's real.
The girls have two heads and two spines, but everything else is shared. They each control and feel one side of the body.
They are nineteen now.
They intend to have normal romantic lives, but how the heck do you handle that? What if one falls in love with a guy the other one can't stand?
They both really dislike being stared at, but if anything is a challenge to that, this may be it, how do you manage to not stare, it so extremely extraordinary.
I've just realized what's so remarkable: they defy the definition of "individual"... you can't divide them without killing them, and yet they are two people!