Rule 34 Dev - all_fours anthro ass big_butt cave cave_painting curvy_figure dinosaur doggy_style duo female from_behind_position hadrosaurid hand_on_butt head_crest hi_res human interspecies lying male male/female mammal nipples on_front ornithischian ornithopod overweight parasaurolophus penetration prehistoric_species raised_tail reptile rock scalie sex signature silhouette size_difference tail upai vaginal_penetration vaginal_penetration voluptuous|12165988344