Don't cross the event horizon with your sword

Gravity magic to take some weight off those shoulders.

Priorities.

A dark spell to lighten the load.

Question 1: Won't the enemy just get sucked into the gravity orb as well?
Question 2: Won't it be quicker to just send a small gravity orb to the enemy, causing their head to collapse?
Question(statement) 3: That's not how gravity works. Assuming the orb exerts a constant pulling force, the spread of pulling force would be more concentrated on the closest object (which is Ai-chan's head and honkers, which explains why they float like that) whereas the rest of her body gets supported by those two objects. But hey, fantasy physics!

Rathurue said:

Question 1: Won't the enemy just get sucked into the gravity orb as well?
Question 2: Won't it be quicker to just send a small gravity orb to the enemy, causing their head to collapse?
Question(statement) 3: That's not how gravity works. Assuming the orb exerts a constant pulling force, the spread of pulling force would be more concentrated on the closest object (which is Ai-chan's head and honkers, which explains why they float like that) whereas the rest of her body gets supported by those two objects. But hey, fantasy physics!

Answer to all three: MAAAAAGIC!

Even in the Fantasy AU she still suffers back pains.

Is it me or there are interesting window for "that" too.

Richtofen said:

Is it me or there are interesting window for "that" too.

Nope, not just you. I'm pretty sure it's to make it easier for her to recharge Onīsan's sword without taking off her top, based on the IsekAi dôjinshi volume.