I really like the idea of Sakuya pretty much losing all of her charisma and tidiness whenever she's spending time with her girlfriend.
Oh my Akis, so do I. I'm tired of people who think making her a rigid, humorless, almost-hypnotically-devoted maid character 24/7 is funny.
Especially since canonically she is unquestionably loyal to Remilia and diligently hard-working as Head Maid, but also quite capable of humor, even at her own mistress's expense, and more than willing to (lightly) chide said mistress when necessary.