... You know, I'm wondering now whether that would even work on a Remilia -- or, for that matter, any other non-sweet-based yukkuri, such as an Utsuho, or a Medicine, or others. I always got the impression that spicy things hurt yukkuris because sweet and spicy are incompatible flavors -- hence the "Super Spicy Reimu" being sickened by sweets instead.
Maybe Bitterstuff still works on Remilias like with average yukkuris, since remilias like sweets but since they are meat made they may be able to tolerate a bit of spiciness, not the ammount this sakuya is putting though >_>.
But i have the theory that, the "rare" or "beyond the archetypical group" the yukkuri species is, the less problems she has with any sort of "anti yukkuri food" like spicy stuff or bitter stuff, yet not necessarily becoming "anti sweets".