2girls, ahoge, animal ears, belt, birthday, black hair, black ribbon, black skirt, casual, closed eyes, collarbone, cup, earrings, frilled shirt collar, frills, furrowed brow, grey hair, hair between eyes, happy birthday, holding, holding cup, holding teapot, horse ears, horse girl, huge ahoge, indoors, jewelry, long bangs, long hair, long sleeves, medium hair, multicolored hair, multiple girls, neck ribbon, off-shoulder shirt, off shoulder, official alternate costume, parody, pendant, pouring, purple shirt, ribbon, shirt, single earring, sitting, skirt, tea, teacup, teapot, two-tone hair, unamused, window, yellow eyes