You' re the best Sienna, the best! I feel the yuri vibes about Sienna with Katarina.
Anyway, I don't understand why most of you find it difficult to accept the yuri route, either here, or in the main work, the variety of choices that Katarina has, gives it dynamism. Some even call it a forced yuri when it isn't. After all, if the author brought in women who may be attracted to the protagonist and has taken them so far (see María in the main work), it is for something.