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Aquarina saw how Sylphy was unleashing her spirits and familiars powers, it was amazing. Instead of just simply conjuring some magic herself, she was using the help of her familiars to fight, conjuring fire through Ignatius and Nature magic through Naturia, and even enhancing the size and power of her familiar demon through mana, Furoh, who had begun to develop his own magic of curse and darkness… Since she was a little baby that she had looked up to Sylphy, and since those times where she shared a bed with her and the two girls became friends, that she had been slowly developing strong feelings for her as well, strong feelings that were the major driving force for her motivation to grow stronger.
Check "The Protagnist's Sister Is Actually the Strongest"!