tenshi/shion are the like. most annoyingly miserable girl you know with the worst luck dating the msot annoyingly egotistical girl you know who has never had anything go wrong for her in her whole life
and somehow it's really cute?
it's cute from a distance, you don't want to talk to either of them, but like. you're glad someone can pay for shion's medical bills at least and they're actually v charming when they aren't near you
okay that's all the polycules and obvious relationships i can think of in touhou