This celebration took place long before the beginning of their relationship in modernau (she was then in the first rel). In the company of her brother (everyone is older there), where Aida got not quite planned, and it was as awkward as possible for her, so she quickly got drunk to feel more free. She gets drunk not only quickly, but instantly + becomes even more flirtatious and receptive (this is the case when she "felt" a negative atmosphere in her direction and she was overwhelmed), which is partly why she unknowingly stuck to Appy tk that evening, despite their not very good relationship - he is quite gentle and sweet with I talked to her.

Appy, on the contrary, gets drunk longer, but in general, when he drinks (and drinks only in the company of loved ones), he is a priori more sociable, becomes a little more talkative and even more "direct"

So it was a strange, awkward and infuriating situation for Aida, where she and Appy usually tease each other, but this time the communication is going so well that she wants and pricks, and she seems ashamed to show that she was strongly hooked on the dialogue (with a displeased face, she said strange facts and nonsense to support conversation)

In the background: the moment when you were distracted for a while, and your ld is suspiciously sociable with your monkey sister, and she is flirtatiously flirtatious (Aida's relationship with her brother in modernity is my separate love ahaha)