Rule 34 Dev - 1boy 1girl ass bare_shoulders bath bathing bathtub bird black_hair blush breasts brown_hair clavicle duck embarrassed heart hetero keizo_(artist) long_hair looking_at_another looking_to_the_side makise_kurisu male mixed_bathing nude okabe_rintarou parted_lips rubber_duck simple_background steins;gate toy water yellow_eyes|786291