Rio Tsukatsuki - Blue Archive - Fanart

Sensei breaks through Rio Tsukatsuki’s cold, calculating exterior during a late-night session at Millennium, leading to an intense night of shared vulnerability and explosive passion in her private office.

The fluorescent lights of the Seminar office hummed with a low, steady drone that matched the rhythmic tapping of Rio Tsukatsuki’s fingers against her glass desk. Outside, the sprawling skyline of Millennium Science School was a sea of twinkling lights, but inside this sanctum of logic and order, only the cold glow of multiple monitors illuminated Rio’s sharp features. She was the "Big Sister," the president who carried the weight of the city’s future on her shoulders, yet tonight, the numbers on her screens felt unusually hollow.