Unfortunately that sounds a little weak to me.
I'm happy to do something set in the Final Fantasy X-2 universe but I would like to do something more immerse. If you like I can suggest a plot but i'd need to know what sort of an RP you're looking to do.
1) What roles do you yourself play? (I mean role, not character, i.e. 'the babied one in the story', 'a mommy', etc.) What role would you like me to play.
2) Which character would you like the play? (It's better to just try and focus on one. The rest are secondary) And for me to play?
3) Mental or Physical Regression?
Well, if you could answer those for now, it's a start and I can start suggesting a plot we might be able to follow and we can discuss.