Sex
Probably very passionate.
Marraige Prospects
I dont think that they would get married. The idea of Treize being tied down to one person doesnt seem to work for me.
Hints
Oh, there are plenty here. The whole fighing thing, if you dont beleive that they feel something for eachother, it is at least obvious that they have a deep respect for one another.
Overall
I dont particularly like this pairing, but it seems very possible. It seems that they would be an intulectual couple, and very passionate. I think they would
have get jealous of eachother easily, and would be heated as long as it lasted. Maybe living together, but i cannot see them growing old together. They
would ultimately find someone else.