Tag calculus

kabayaki unagi, cirno, phantasmagoria of flower view, touhou, non-web source, third-party edit, 1girl, adjusting eyewear, bespectacled, blue eyes, blue hair, board eraser, calculus, chalkboard, circled 9, female focus, glasses, laser, matching hair/eyes, math, parody, ribbon, role reversal, science, solo, wings
1 view