They are brother and sister. That’s sick.
And yes, it is official that they are brother and sister. Catherine and Triton Bloom. It may be true that Trowa and Catherine themselves are unaware of this bond, but go and read the Trowa an Quatre section.
Trowa and Catherine share a close relationship in that they think of each other as siblings figure. Catherine was separated from her family at an age in which she probably remembers having a younger brother, and therefore perhaps sees Trowa as being somewhat of a replacement. She’s a kind person that instinctually takes care of others.
In conclusion
Pairing them together is incest. Enough said.
