1boy, 2girls, ahoge, black gloves, blush, closed mouth, demon girl, demon horns, demon wings, disembodied limb, feeding, forehead, gloves, grey hair, hair ornament, hair over shoulder, halo, headpat, holding, holding pen, horns, military, military uniform, multiple girls, pen, ponytail, purple eyes, red eyes, thinking, twintails, uniform, white hair, wings, working, writing