Yeah, I get that. The thing is that I never saw Seishirou's interest in Subaru as anything but a possible business rival and a part of a personal experiment, which means that in my eyes, there never was a potential for love in the first place. I also wouldn't say that they destroy each other - Seishirou destroys Subaru, and goes on his merry way while Subaru's entire world is shattered.

People are free to ship what the want, but I think it takes a lot of squinting to read this pairing as something with a potential for romance in canon. Seishirou is utterly dysfunctional: he killed the most important person in Subaru's life, nearly killed Subaru himself, and in X he cheerfully joins the club to end humanity. Subaru, for his part, fell in love with a person who never existed; the real Seishirou was a far cry from the dorky veterinarian next door. One of my big, big problems with X was that it really seems to suggest that this was somehow a relationship that was doomed by cruel fate, not by one of the parts being screwed up beyond all and any repair. Tragically, I know not to expect anything better from Clamp.

Anyway, sorry for blathering on about this. I really do see the point about the attempt to love each other, but I'll never be able to use the word love about what Seishirou was doing with Subaru.