If you know the way what magical energy works on original fate serie, I would be offended with "doesn''t have the magical energy to keep both satisfied"
I wish there's choices with actual differences in games like these since it annoys me how the MC would act in a way or make choices that I would never do in a game if I had a choice.
They try so badly to make her go away, but they're way too nice about it and fail every time. She is clearly without a master for a reason, lol. That makes me believe that she contradicts the typical master mana bond and that Aria is self-serving in a way implying she is way stronger or if she is just really good at managing her mana unless they explain in the game that she cannot go without mana for a long period of time. Give her a husband.