Rule 34 Dev - 2boys bite_mark blush breath four_seasons_(artist) from_behind gay gintama gintoki_sakata heart-shaped_pupils katsura_kotarou long_hair long_hair_male looking_back looking_pleasured male male_only monochrome nipple_pinch nipple_tweak off_shoulder open_mouth sketch tongue_out wrist_grab yaoi|12029034424