1girl, between_legs, breasts, brown_eyes, cleavage, closed_mouth, collarbone, equation, glowing_windows, hallway, hand_between_legs, hxxg, light_particles, long_hair, looking_at_viewer, math, monogatari_(series), off_shoulder, oikura_sodachi, on_chair, pajamas, sitting, solo, trigonometry, twintails, window, yellow_pajamas