2boys, ahoge, blush, collarbone, completely_nude, cum, greyscale, hand_on_another's_cheek, hand_on_another's_face, hand_on_another's_stomach, hand_on_another's_thigh, hand_up, implied_sex, male_focus, monochrome, multiple_boys, navel, nipples, nude, short_hair, simple_background, sketch, smile, yaoi