In the second episode, Aina finds herself drawn into her siblings' secretive relationship after her discovery. Venturing into her brother's chamber under the veil of night, she applies the intimate skills she has acquired through covert observation to steer the situation. As waves of sensation overwhelm her, Aina's resistance weakens, and she begins to embrace the same path of training that has already claimed her older sister. Together with Rena, she gradually succumbs to the deepening influence of their brother.