I'd like to throw lots of Zelda and Terra at him. Yuffie will probably ignore him for the time being and Yuna is slowly warming up to him. I don't have any specific ideas but it would be nice if he did open up. Though I don't know if he would open up to Zelda or not or one of my other muses.

Also Yuffie will take care of Spencer, even if she doesn't like Sephiorth she likes Spence a lot lol. That or Zelda will always welcome lost moogles.