oyama mahiro, oyama mihari, onii-chan wa oshimai!, absurdres, commentary request, highres, 2girls, :d, ahoge, belt, black hair, brown eyes, colored inner hair, grey hair, hair between eyes, hair ornament, hairclip, hand on another's head, hug, indoors, lab coat, light blush, long hair, multicolored hair, multiple girls, off shoulder, open mouth, oversized clothes, oversized shirt, pink hair, purple hair, red shirt, shirt, siblings, sisters, smile, syouyuazidesu, t-shirt, twintails, two-tone hair, white shirt