anthro anus balls bara barazoku big_balls big_butt big_penis butt erection gaping gaping_anus genitals jungle looking_at_viewer looking_back male muscular muscular_anthro muscular_male partially_submerged penis perineum raised_tail rear_view river solo standing vein veiny_penis rulethony34tano_(director) crocodile crocodilian crocodylid reptile scalie tail