I gotta go with jim993 on this one if only for the reason I'm old enough to be all of their's(?) father and would feel like a dirty old fart.
If, though, I were 20 again, probably mysticales. Cyn is too scary and I have visions of being handcuffed, bent over the kitchen table, with a red ass saying,"please ma'am, may I have another?". Cecilia would probably just want to show me all her "neat" hk sega goodies that we mere westerners could never obtain, all the while laughing hysterically. I don't know enough of Myst's personality to be frightened...yet. Live and learn, live and learn. (this was all tongue in cheek...keep it clean.)