I thought this was pretty well done as a comedy series, and introducing Kujou did actually make it funnier so I would call it a success on that front, but looking through the lens of pure yuri I understand how it is a bit disappointing :P I liked it a lot, it was simple humour done extremely well, it even managed to do some character development for Yaya (she's no longer a crybaby in a hell of her own making by the end). Nothing groundbreaking but very competent.
I also don't think it would feel right to end it here with a relationship out of nowhere or whatever, maybe if it was allowed to run for longer it could feel more natural. Contrast that with that other series that's about to end where relationship is almost certain but it was fumbled so badly no one gives a shit anymore lmao