Rule 34 Dev - anthro ass avian back_muscles beak big_ass big_butt big_muscles blue_background border bubble_ass bubble_butt butt_focus darkner deltarune duo elemental_creature elemental_humanoid eyewear fat_ass fat_butt feathers fire fire_creature fire_humanoid gay glasses grillby hi_res humanoid looking_at_another male male_only muscular muscular_anthro muscular_ass muscular_butt muscular_humanoid muscular_male nude rear_view redeyedgazer round_ass round_butt signature simple_background smile standing swatch_(deltarune) thick_ass thick_butt undertale video_games white_border|5870541568