Oh yes, not often (ever?) do I get to see my two favorite Touhous together. Apparently I must have a wing fetish since they have about nothing else in common.
I've seen a few every now and then. In fact the two pairing seem to be quite popular, if you can count about 5-7 posts.
It will be nice if it become some sort of new phase. I do enjoy the thought of Remilia being blind as a bat and Mystia having yet another predator besides yuyuko. Its gotten quite old.