citizen k (pngj5475), arato nagi, ruri no houseki, commentary, highres, paid reward available, symbol-only commentary, 1girl, 2boys, black eyes, black hair, black jacket, blue necktie, blue pants, blush, boy sandwich, breast press, breasts, bulge, button gap, chikan, clothed sex, collared shirt, cowboy shot, curvy, dark-skinned male, dark skin, denim, dry humping, earrings, erection, erection under clothes, formal clothes, from side, hetero, huge breasts, humping, jacket, jeans, jewelry, long hair, looking down, molestation, multiple boys, necktie, no bra, pants, parted lips, plump, profile, sandwiched, see-through clothes, see-through shirt, sex, shirt, shirt tucked in, sleeves rolled up, solo focus, standing, standing sex, steam, steaming body, stud earrings, suit, sweat, train interior, white shirt, wing collar