I made multiple saves in order to try achieving multiple endings, got the reunion ending on my first try, and wound up fully uninterested in getting any of the others besides devotion; Ais is too sweet for me to intentionally antagonize her.
It's really sad that, after a first visit of you simply existing near her without causing either of you problems, she proceeds to actively make plans for an outing she thinks would be safe and enjoyable for both of you, protect you if you slip up on self-preservation that should be rather basic, give you advice and even speak to you cordially... and yet, she still considers you the one who offered her unprompted kindness. I also find it really interesting how measuredly she picks her words, and how that translates into discomfort and even fear when caught off-guard; it's criminal how few stories featuring fae delve into the lack of autonomy, privacy, safety and trust that being unable to lie would cause.